#include <bits/stdc++.h>

int main() {
 
  std::string n1, n2;
  std::string p1, p2;
  std::string c1, c2;

  std::cin >> n1 >> p1 >> c1;
  std::cin >> n2 >> p2 >> c2;

  if( p1.size() > p2.size() ) {
    std::cout << n1 << std::endl;
    return 0;
  }

  if( p1.size() < p2.size() ) {
    std::cout << n2 << std::endl;
    return 0;
  }

  for(int i = 0; i < p1.size(); ++i) {
    if( p1[i] > p2[i] ) {
      std::cout << n1 << std::endl;
      return 0;
    }
    if( p1[i] < p2[i] ) {
      std::cout << n2 << std::endl;
      return 0;
    }
  }

  std::cout << "-1" << std::endl;

  return 0;
}