#include<bits/stdc++.h>
#define raed read
using namespace std;
const int MAXN = 210,INF = 0x3f3f3f3f,mod = 1e9+7;
const double eps = 0.0001;
int n,m,k;
string s[MAXN][MAXN];
signed main(){
	//T = read();
		cin>>n>>m>>k;
		map<string,int> mp;
		for(int i=1;i<=n;i++){
			for(int j=1;j<=m;j++){
				for(int p=1;p<=k;p++){
					char c;
					cin>>c;
					s[i][j]+=c;
					mp[s[i][j]]++;
				}
			}
		}
		for(auto x:mp){
			if(x.second==1){
				for(int i=1;i<=n;i++){
					for(int j=1;j<=m;j++){
						if(s[i][j]==x.first){
							cout<<i<<" "<<j<<endl;
							return 0;
						}
					}		
				}
			}
		}
}
/*
3 5 3
QWQQWQQWQQWQQWQ
QWQQWQQWQQWQQWQ
QWQQWQQWQQWQQwQ
*/