#include <bits/stdc++.h>
#define int long long
#define db double
#define ll unsigned long long
#define lson (rt << 1)
#define rson (rt << 1 | 1)

using namespace std;

const int N = 5010;
 
inline int read () {
    int w = 1, s = 0; char ch = getchar();
    for (; ! isdigit(ch); ch = getchar()) if (ch == '-') w = - 1;
    for (; isdigit(ch); ch = getchar()) s = (s << 1) + (s << 3) + (ch ^ 48);
    return s * w;
}

void solve () {
	int n;
    cin >> n;

    vector <bitset <N>> bit (n);
    for (int i = 0; i < n; i ++) {
        string s;
        cin >> s;

        for (int j = 0; j < n; j ++) {
            bit[i][j] = s[j] ^ 48;
        }
    }

    vector <int> ans;
    for (int i = 0; i < n; i ++) {
        auto b = bit[i];
        for (int j = 0; j < n; j ++) {
            if (bit[i][j] == 1) {
                b |= bit[j];
            }
        }

        if (b.count () == n - 1) {
            ans.push_back (i + 1);
        }

        if (ans.size () == 3) {
            for (auto x : ans) {
                printf ("%lld ", x);
            }
            return;
        }
    }
    
    printf ("NOT FOUND\n");
}

signed main () {
	ios::sync_with_stdio(false);
    cin.tie(nullptr);
	int TT = 1; 
//	TT = read ();
	while (TT --) solve ();
	return 0;
}