#include<bits/stdc++.h>
using namespace std;
const long long inf = 1e18;
const int mininf = 1e9 + 7;
#define int long long
#define pb emplace_back
inline int read(){int x=0,f=1;char ch=getchar();while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}while(ch>='0'&&ch<='9'){x=(x<<1)+(x<<3)+(ch^48);ch=getchar();}return x*f;}
inline void write(int x){if(x<0){x=~(x-1);putchar('-');}if(x>9)write(x/10);putchar(x%10+'0');}
#define put() putchar(' ')
#define endl puts("")
void solve(){
	int n = read(), m = read(), k = read();
	string pre, pre2;
	bool fl = 1;
	int cnt = 0;
	int mk1, mk2, mk3, mk4;
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= m; j++){
			string s;
			for(int k2 = 1; k2 <= k; k2++){
				char ch;
				cin >> ch;
				s = s + ch;
			}
			if(fl){
				fl = 0;
				pre = s;
				mk1 = i, mk2 = j;
				cnt = 1;
			}else{
				if(s == pre){
					cnt++;
				}else{
					pre2 = s;
					mk3 = i, mk4 = j;
				}
			}
		}
	}	
	if(cnt == 1)	write(mk1), put(), write(mk2), endl;
	else write(mk3), put(), write(mk4), endl; 
}

signed main(){
	int t = 1;
	while(t--)	solve();
	return 0;
}