#include <bits/stdc++.h>

using namespace std;

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

    int n;
    cin >> n;
    map<string, int> mp;
    int mx = -1;
    
    for (int i = 0; i < n; i++) {
        string s;
        cin >> s;
        mx = max(mx, ++ mp[s]);
    }
    string res;
    int cnt = 0;
    for (auto &[x, y] : mp) {
        if (y == mx) {
            res = x;
            cnt += 1;
        }
    }
    if (cnt == 1 && mx > 1) {
        cout << res << '\n';
    } else {
        cout << "uh-oh\n";
    }
    return 0;
}