#include <bits/stdc++.h>

using namespace std;

#define int long long
using i32 = int32_t;
using vi = vector<int>;
const int inf = 1e18;


i32 main() {
    ios::sync_with_stdio(false), cin.tie(nullptr);
    int n;
    cin >> n;
    map<string, int> cnt;
    string s;
    for (; n; n--) cin >> s, cnt[s]++;
    bool flag = false;
    string res = "-1";
    for (auto [k, v]: cnt) {
        if (cnt[res] < v) res = k, flag = true;
        else if (cnt[res] == v) flag = false;
    }
    if (flag) cout << res << "\n";
    else cout << "uh-oh\n";
    return 0;
}