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

int main() {
    int n;
    cin >> n;

    map<string, int> cnt;
    for (int i = 0; i < n; i++) {
        string s;
        cin >> s;
        cnt[s]++;
    }

    int res = 0;
    for (auto &[x, y] : cnt)
        res = max(res, y);

    string ans;
    int c = 0;
    for (auto &[x, y] : cnt) {
        if (y == res)
            ans = x, c++;
    }

    if (c != 1) {
        cout << "uh-oh\n";
    } else cout << ans << '\n';
}