#include <bits/stdc++.h>
using namespace std;
int main() {
	int n, m, k;
	cin >> n >> m >> k;
	vector a(n, vector(m, string(k, 0)));
	map<string, int> cnt;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < m; j++) {
			for (auto &c : a[i][j]) {
				cin >> c;
			}
			cnt[a[i][j]]++;
		}
	}
	for (auto [s, c] : cnt) {
		if (c == 1) {
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < m; j++) {
					if (a[i][j] == s) {
						cout << i + 1 << " " << j + 1 << "\n";
						return 0;
					}
				}
			}
		}
	}
	return 0;
}