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

using i64 = long long;

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

    int n;
    cin >> n;

    map<string, int> mp;
    for (int i = 0; i < n; i++) {
        string s;
        cin >> s;

        mp[s]++;
    }

    string ans = "uh-oh";
    int cnt = 0;
    for (auto [x, y] : mp) {
        if (2 * y >= n) {
            ans = x;
            cnt++;
        }
    }

    if (cnt != 1) {
        ans = "uh-oh";
    }

    cout << ans << endl;

    return 0;
}