#include<bits/stdc++.h>
using namespace std;

#define endl "\n"
using ll = long long;
constexpr int N = 5002;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;
    vector<bitset<N>> st(n);
    for (int i = 0; i < n; i++) {
        string s;
        cin >> s;        
        for (int j = 0; j < n; j++) {
            if (s[j] == '1') {
                st[i].set(j);
            }
        }
        st[i].set(i);
    }
    vector<bitset<N>> dp(n);
    for (int i = 0; i < n; i++) {
        for (int j = st[i]._Find_first(); j != st[i].size(); j = st[i]._Find_next(j)) {
            dp[i] |= st[j];
        }
    }

    vector<int> ans;
    for (int i = 0; i < n; i++) {
        if (dp[i].count() == n) {
            ans.push_back(i + 1);
        }
    }
    if (ans.size() >= 3) {
        for (int i = 0; i < 3; i++) {
            cout << ans[i] << " \n"[i == 2];
        }
    } else {
        cout << "NOT FOUND\n";
    }
    return 0;
}