import std.stdio, std.conv, std.math, std.string, std.range, std.array,
       std.algorithm, std.bigint;

void main() {
  auto buf = readln().strip().split();
  auto name1 = buf[0].to!string();
  auto point1 = buf[1].to!BigInt();
  auto buf2 = readln().strip().split();
  auto name2 = buf2[0].to!string();
  auto point2 = buf2[1].to!BigInt();

  if (point1 > point2) {
    writeln(name1);
  } else if(point2 > point1) {
    writeln(name2);
  } else {
    writeln(-1);
  }
}