#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 210;
int n,m,k,x,y,flag;

string s[N][N];

int main(){
    cin>>n>>m>>k;
    for(int i=1;i<=n;i++)for(int j=1;j<=m;j++){
        string s;
        for(int c=1;c<=k;c++){
            char ch; cin>>ch; s.append(ch,1);
        }
        ::s[i][j] = s;
    }
    for(int i=1;i<=n;i++)for(int j=1;j<=m;j++)if(s[i][j] != s[1][1]){
        if(flag){
            cout<<"1 1\n";
            exit(0);
        }
        flag = 1;
        x = i; y = j;
    }
    cout<<x<<" "<<y<<endl;

    return 0;
}