#include<cstdio>
#include<queue>
using namespace std;
int n,m,map[25][25],k,sa,sb;
int d[4][2]={-1,0,1,0,0,-1,0,1};
char str[25][25];
typedef struct Lnode{
   int x,y,step;
   friend operator<(Lnode a,Lnode b)
   {
       return a.step>b.step;
   }
}node;
int bfs(node start)
{
   priority_queue<node> Q;
   node now,next;
   now=start;
   Q.push(now);
   char c;
   int i,time=0;
   while(!Q.empty())
   {
       now=Q.top();
       Q.pop();
       for(i=0;i<=4;i++)
       {
           next.x=now.x+d[i][0];
           next.y=now.y+d[i][1];
           next.step=now.step+1;
           if(next.x>=0&&next.y>=0&&next.x<n&&next.y<m&&(str[next.x][next.y]=='-'||str[next.x][next.y]=='|'))
           {
               if(!(now.step%2))
                   c=str[next.x][next.y];
               else if(now.step%2)
               {
                   if(str[next.x][next.y]=='|')
                       c='-';
                   else
                       c='|';
               }
               if(((d[i][0]==-1&&d[i][1]==0)||(d[i][0]==1&&d[i][1]==0))&&c=='|')
               {
                   next.x+=d[i][0];
                   next.y+=d[i][1];
               }
               else if(((d[i][0]==0&&d[i][1]==-1)||(d[i][0]==0&&d[i][1]==1))&&c=='-')
               {
                   next.x+=d[i][0];
                   next.y+=d[i][1];
               }
               else if(((d[i][0]==-1&&d[i][1]==0)||(d[i][0]==1&&d[i][1]==0))&&c=='-')
               {
                   next.x+=d[i][0];
                   next.y+=d[i][1];
                   next.step++;
               }
               else if(((d[i][0]==0&&d[i][1]==-1)||(d[i][0]==0&&d[i][1]==1))&&c=='|')
               {
                   next.x+=d[i][0];
                   next.y+=d[i][1];
                   next.step++;
               }
           }
           if(next.x>=0&&next.y>=0&&next.x<n&&next.y<m&&map[next.x][next.y]==0)
           {
               if(str[next.x][next.y]=='T')
                   return next.step;
               else if(str[next.x][next.y]=='.')
               {
                   map[next.x][next.y]=1;
                   Q.push(next);
               }
           }
       }
   }
   return -1;
}
int main()
{
   int i,j,time;
   while(scanf("%d%d",&n,&m)!=-1)
   {
       k=0;
       for(i=0;i<n;i++)
       {
           scanf("%s",str[i]);
           for(j=0;j<m;j++)
           {
               if(str[i][j]=='S')
               {
                   sa=i;sb=j;
               }
           }
       }
       memset(map,0,sizeof(map));
       node start;
       start.step=0;
       start.x=sa;
       start.y=sb;
       map[sa][sb]=1;
       time=bfs(start);
       printf("%d\n",time);
   }
   return 0;
}