<?php

$input1 = trim(fgets(STDIN));

list($player1,$player1Point,$player1hand) = explode(" ", $input1);

$str1 = strlen($player1Point);

$input2 = trim(fgets(STDIN));

list($player2,$player2Point,$player2hand) = explode(" ", $input2);

$str2 = strlen($player2Point);

if($str1 > $str2){
    $str2 = str_pad($str2,$str1,"0",STR_PAD_LEFT);
}else{
    $str1 = str_pad($str1,$str2,"0",STR_PAD_LEFT);
}

if($str1 < $str2){
    echo $player2."\n";
}else if($str1 > $str2){
    echo $player1."\n";
}else{
    echo "-1"."\n";
}