#include<bits/stdc++.h>
#define ll long long int

using namespace std;


int main(){

ll t;  cin>>t;

while(t--){

int n,m;  cin>>n>>m;
int a[n][m],b[n][m];
string s;

 for(int i=0;i<n;i++){
    cin>>s;
    for(int j=0;j<m;j++){
        a[i][j] = (s[j] - '0');
    }
 }


 for(int i=0;i<n;i++){
    cin>>s;
    for(int j=0;j<m;j++){
        b[i][j] = (s[j] - '0');
    }
 }

 int dr = -n, dc = -m;
 int ans = INT_MAX, r , c, cmp, tp;

 while(dr < n){
    dc = -m;
    while(dc < m){
        tp = 0;
    for(int i=0;i<n;i++){
        for(int j=0;j<m;j++){
            r = i + dr;
            c = j + dc;
            if(r < 0 || r > n || c < 0 || c > m){
                cmp = 0;
            }
            else{
                cmp = b[r][c];
            }
            if(cmp != a[i][j]){
               tp++;
            }
        }
    }

   ans = min(ans,tp);
   dc++;
   }
 dr++;
 }
cout<<"ANS "<<ans<<endl;
}

return 0;
}