#include <bits/stdc++.h>
using namespace std;
  
// #define int long long
#define pb push_back
#define print(Target) cout << Target << '\n'

#define REP(i, n) for (int i = 0; i < (n); i++)
#define REPS(i, a, n) for (int i = (a); i < (n); i++)

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vector<int> > vii;
typedef pair<int, int> pii;

bool is_uruu(int y) {return (y % 4 == 0 && (y % 100 != 0 || y % 400 == 0));}

struct P{
  string name;
  ll n;
  char c;
};

signed main()
{
  ios::sync_with_stdio(false);
  P p[2];
  REP(i, 2) cin >> p[i].name >> p[i].n >> p[i].c;
  if (p[0].n != p[1].n) print(p[p[0].n < p[1].n].name);
  else print("-1");

  return (0);
}