#include <bits/stdc++.h>

using namespace std;
const int N=1e5+100;

int n;
string s[N];

int main(){
	scanf("%d",&n);
	for (int i=1;i<=n;i++){
		cin>>s[i];
	}
	s[0]="";
	sort(s+1,s+n+1);
	string mx="";int cur=1,tms=1;
	for (int i=1;i<=n;i++){
		if (s[i]==s[i-1]){
			cur++;
			continue;
		}
		if (cur>tms){
			tms=cur;
			mx=s[i-1];
		}
		cur=1;
	}
	if (cur>tms){
		tms=cur;
		mx=s[n];
	}
	if (tms>n/2) cout<<mx<<endl;
	else puts("uh-oh");
	return 0;
}