#include <algorithm>
#include <cstdio>
#include <cstring>
using std::max;
using std::swap;
const int MAXN=30010,MAXM=60010;
int n,q;
class HLD
{
    public:
        HLD(void)
        {
            num=cnt=0;
            memset(vis,0,sizeof vis);
            memset(head,0,sizeof head);
            memset(p,0,sizeof p);
        }
        void Init(void)
        {
            for(int i=1,x,y;i<n;++i)
            {
                scanf("%d %d",&x,&y);
                AddEdges(x,y);
            }
            for(int i=1;i<=n;++i)
                scanf("%lld",&p[i].v);
            DFS1(1,1),DFS2(1,1),T.Build(this,1,1,n);
        }
        void ChangeNode(int i,long long v)
        {
            T.Update(p[i].DFN,v);
        }
        long long MaxPath(int x,int y)
        {
            int a,b;
            long long ans=-MAXN;
            while((a=p[x].top)^(b=p[y].top))
                p[a].d>p[b].d ? (ans=max(ans,T.Maxv(1,p[a].DFN,p[x].DFN)),x=p[a].ft) : (ans=max(ans,T.Maxv(1,p[b].DFN,p[y].DFN)),y=p[b].ft);
            if(p[x].d>p[y].d)
                swap(x,y);
            return max(ans,T.Maxv(1,p[x].DFN,p[y].DFN));
        }
        long long SumPath(int x,int y)
        {
            int a,b;
            long long ans=0;
            while((a=p[x].top)^(b=p[y].top))
                p[a].d>p[b].d ? (ans+=T.Sum(1,p[a].DFN,p[x].DFN),x=p[a].ft) : (ans+=T.Sum(1,p[b].DFN,p[y].DFN),y=p[b].ft);
            if(p[x].d>p[y].d)
                swap(x,y);
            return ans+T.Sum(1,p[x].DFN,p[y].DFN);
        }
    private:
        bool vis[MAXN];
        int num,cnt,head[MAXN],rank[MAXN];
        struct node
        {
            int d,ft,top,son,size,DFN;
            long long v;
        }p[MAXN];
        struct edge
        {
            int nxt,to;
            edge(int _nxt=0,int _to=0)
            {
                nxt=_nxt,to=_to;
            }
        }e[MAXM];
        class SegmentTree
        {
            public:
                void Build(HLD *SgT,int i,int l,int r)
                {
                    s[i]=node(l,r);
                    if(l==r)
                    {
                        s[i].v=s[i].maxv=SgT->p[SgT->rank[l]].v,f[l]=i;
                        return;
                    }
                    int j=i<<1,mid=l+r>>1;
                    Build(SgT,j,l,mid),Build(SgT,j|1,mid+1,r),PushUp(i);
                }
                void Update(int i,long long v)
                {
                    s[i=f[i]].v=s[i].maxv=v;
                    do
                        PushUp(i>>=1);
                    while(i>1);
                }
                long long Maxv(int i,int l,int r)
                {
                    if(l==s[i].l && r==s[i].r)
                        return s[i].maxv;
                    int j=i<<1,mid=s[i].l+s[i].r>>1;
                    if(r<=mid)
                        return Maxv(j,l,r);
                    else if(l>mid)
                        return Maxv(j|1,l,r);
                    else
                        return max(Maxv(j,l,mid),Maxv(j|1,mid+1,r));
                }
                long long Sum(int i,int l,int r)
                {
                    if(l==s[i].l && r==s[i].r)
                        return s[i].v;
                    int j=i<<1,mid=s[i].l+s[i].r>>1;
                    if(r<=mid)
                        return Sum(j,l,r);
                    else if(l>mid)
                        return Sum(j|1,l,r);
                    else
                        return Sum(j,l,mid)+Sum(j|1,mid+1,r);
                }
            private:
                int f[MAXN];
                struct node
                {
                    int l,r;
                    long long v,maxv;
                    node(int _l=0,int _r=0)
                    {
                        l=_l,r=_r,v=0,maxv=-MAXN;
                    }
                }s[MAXN<<2];
                void PushUp(int i)
                {
                    int l=i<<1,r=l|1;
                    s[i].v=s[l].v+s[r].v;
                    s[i].maxv=max(s[l].maxv,s[r].maxv);
                }
        }T;
        void AddEdge(int u,int v)
        {
            e[++cnt]=edge(head[u],v);
            head[u]=cnt;
        }
        void AddEdges(int u,int v)
        {
            AddEdge(u,v),AddEdge(v,u);
        }
        void DFS1(int u,int k)
        {
            p[u].d=k,p[u].size=1;
            for(int i=head[u],v;i;i=e[i].nxt)
                if(!p[v=e[i].to].size)
                {
                    DFS1(v,k+1);
                    p[v].ft=u,p[u].size+=p[v].size;
                    if(p[v].size>p[p[u].son].size)
                        p[u].son=v;
                }
        }
        void DFS2(int u,int top)
        {
            vis[u]=p[u].top=top,p[u].DFN=++num,rank[num]=u;
            if(p[u].son)
                DFS2(p[u].son,top);
            for(int i=head[u],v;i;i=e[i].nxt)
                if(!vis[v=e[i].to])
                    DFS2(v,v);
        }
}HLT;
int main(int argc,char *argv[])
{
    scanf("%d",&n);
    HLT.Init();
    scanf("%d",&q);
    for(int i=1,u,v;i<=q;++i)
    {
        char opt[10];
        long long k;
        scanf("\n%s %d",opt,&u);
        if(!strcmp(opt,"CHANGE"))
        {
            scanf("%lld",&k);
            HLT.ChangeNode(u,k);
        }
        else
        {
            scanf("%d",&v);
            if(!strcmp(opt,"QMAX"))
                printf("%lld\n",HLT.MaxPath(u,v));
            else
                printf("%lld\n",HLT.SumPath(u,v));
        }
    }
    return 0;
}