// 長い夜の終わりを信じながら
// Think twice, code once.
#include <cstdio>
#include <string>
#include <cstring>
#include <iostream>
#include <algorithm>
#define eputchar(c) putc(c, stderr)
#define eprintf(...) fprintf(stderr, __VA_ARGS__)
#define eputs(str) fputs(str, stderr), putc('\n', stderr)
using namespace std;

int n, m, k;
char ch[205][205][15];

int check(int _x, int _y, int x_, int y_) {
	for (int i = 1; i <= k; i++)
		if (ch[_x][_y][i] != ch[x_][y_][i]) return 0;
	return 1;
}

int main() {
	scanf("%d%d%d", &n, &m, &k);
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++)
			for (int l = 1; l <= k; l++) scanf(" %c", &ch[i][j][l]);
	int ax = 1, ay = 1, bx = 1, by = 2;
	if (m == 1) bx = 2, by = 1;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++) {
			if (i == ax && j == ay) continue;
			if (i == bx && j == by) continue;
			int a = check(ax, ay, bx, by), b = check(ax, ay, i, j), c = check(bx, by, i, j);
			if (a && b && c) continue;
			if (a) {printf("%d %d\n", i, j); return 0;}
			if (b) {printf("%d %d\n", bx, by); return 0;}
			if (c) {printf("%d %d\n", ax, ay); return 0;}
		}
	return 0;
}