#include <iostream>
#include <unordered_set>
#include <vector>

using namespace std;

char get_char(uint32_t val) {
	char ch = 'A';
	for (; val; val = (val >> 1))
		ch++;
	return ch-1;
}
int main() {
	for (;;) {
		int n; cin >> n;
		if (cin.eof()) break;
		
		vector<uint32_t> rows(n, 0);
		vector<uint32_t> cols(n, 0);
		unordered_set<uint32_t> right;
		uint32_t right_seq = 0;
		vector<vector<char>> s (n, vector<char>(n));

		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				char c; cin >> c;
				s[i][j] = c;
				rows[i] |= (1 << (c-'A'));
				cols[j] |= (1 << (c-'A'));	
			}
			if (right.find(rows[i]) != right.end())
				right_seq = rows[i];
			else right.insert(rows[i]);
		}

		int r, c;
		uint32_t lost;
		for (int i = 0; i < n; i++)
			if (rows[i] != right_seq) {
				r = i;
				lost = right_seq & ~(rows[i]);
				break;
			}
		
		for (c = 0; c < n; c++) 
			if (cols[c] != right_seq)
				break;

		cout << r+1 << ' ' << c+1 << ' ' << get_char(lost) << '\n';

	}
	return 0;
}