#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
const ll inf = 1e16;
const ll md = 1000000007;

string s[2];
string p[2];

string win(){
  string a,b;
  a=p[0];
  b=p[1];
  if(a.size()>b.size()) return s[0];
  if(a.size()<b.size()) return s[1];
  rep(i,a.size()){
    if(a[i]>b[i]) return s[0];
    if(a[i]<b[i]) return s[1];
  }
  return "-1";
}

int main() {
  string x;
  rep(i,2) cin>>s[i]>>p[i]>>x;
  cout<<win()<<endl;
  return 0;
}