#include<bits/stdc++.h>
#define L(i, j, k) for(int i = (j); i <= (k); ++i)
#define R(i, j, k) for(int i = (j); i >= (k); --i)
#define ll long long
#define vi vector <int>
#define sz(a) ((int) (a).size())
#define me(f, x) memset(f, x, sizeof(f))
#define uint unsigned int
#define ull unsigned long long 
#define i128 __int128
using namespace std; 
const int N = 1e6 + 7, mod = 998244353;
int n, m;
string s[N];
int main() {
//	freopen("data.txt", "r", stdin);
	ios :: sync_with_stdio(false);
	cin.tie(0); cout.tie(0);
	cin >> n;
	L(i, 1, n) {
		cin >> s[i];
	}
	sort(s + 1, s + n + 1);
	int mid = (n + 1) / 2;
	L(i, 1, n - mid + 1) {
		if(s[i] == s[i + mid - 1]) {
			cout << s[i] << '\n';
			return 0;
		}
	}
	cout << "uh-oh\n";
	return 0;
}