#include <bits/stdc++.h>
#define PB push_back
#define MP make_pair
#define REP(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define ALL(a) (a).begin(),(a).end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
const int INF=1e9;
const int MOD=100000;
int B=1000000;
int main(){
      string s[2];
      char c[2];
      int p[2];
      REP(i,2)cin>>s[i]>>p[i]>>c[i];
      if(p[0]>p[1]){
            cout<<s[0]<<endl;
      }else if(p[1]>p[0]){
            cout<<s[1]<<endl;
      }else cout<<-1<<endl;
      return 0;
}