#include "bits/stdc++.h"
using namespace std;
const int maxn = 3e5 +7 ;
typedef long long ll;


int a[maxn][10],n,m,max_num,pos[260],num[maxn],ansx,ansy;
int ok(int x)
{
    memset(pos, 0 ,sizeof pos);
    for(int i=1 ;i<=n ;i++)
    {
        int temp =0 ;
        for(int j=1 ;j<=m ;j++)
        {
            if(a[i][j]>=x) temp+=1<<(j-1);
        }
        num[i] = temp;
        pos[temp] = i;
    }
    
    for(int i=0 ;i<=max_num;i++)
    {
        if(pos[i]==0) continue;
        for(int j=1 ;j<=n ;j++)
        {
            if((num[j]|i) == max_num)
            {
                ansx = pos[i];
                ansy = j;
                return 1;
            }
        }
    }
    return 0;
}
int main()
{
    ios::sync_with_stdio(false);
    cin>>n>>m;
    max_num = 1<<m,max_num--;
    for(int i=1 ;i<=n ;i++)
    {
        for(int j=1 ;j<=m ;j++)
        {
            cin>>a[i][j];
        }
    }
    int l =0 ,r = 1000000000;
    while(l<=r)
    {
        int mid = (l+r)>>1;
        if(ok(mid)) l = mid+1;
        else r = mid-1;
    }
    cout<<ansx<<" "<<ansy<<endl;
    return 0;
}