#include <bits/stdc++.h>
using namespace std;

signed main(){
  string name[ 2 ], yuru[ 2 ], jyan[ 2 ];
  for( int i = 0; i < 2; ++i )
    cin >> name[ i ] >> yuru[ i ] >> jyan[ i ];
  if( yuru[ 0 ].size() != yuru[ 1 ].size() )
    cout << name[ yuru[ 0 ].size() < yuru[ 1 ].size() ] << endl,
    exit( 0 );
  else if( yuru[ 0 ] != yuru[ 1 ] )
    cout << name[ yuru[ 0 ] < yuru[ 1 ] ] << endl,
    exit( 0 );
  else
    cout << -1 << endl;
  return 0;
}