#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,m;
const int N=2e5+7;
string ss[N];
void solve(){
    cin>>n;
    string s;
    int ma=0;
    int cnt=0;
    map<string,int> mp;
    for(int i=1;i<=n;i++){
        cin>>ss[i];
        mp[ss[i]]++;
    }
    for(int i=1;i<=n;i++){
        if(mp[ss[i]]>ma){
            cnt=0;
            ma=mp[ss[i]];
            s=ss[i];
        }else if(mp[ss[i]]==ma&&s!=ss[i]){
            cnt=1;
        }
    }
    if(cnt==1){
        cout<<"uh-oh"<<endl;
    }else{
        cout<<s<<endl;
    }
}
signed main(){
    int t=1;
    //cin>>t;
    solve();
}