<?php
list($first_name, $first_point, $devnull) = explode(' ', trim(fgets(STDIN)));
list($second_name, $second_point, $devnull) = explode(' ', trim(fgets(STDIN)));
if($first_point == $second_point) {
    echo '-1';
} else if($first_point > $second_point) {
    echo $first_name;
} else {
    echo $second_name;
}
echo PHP_EOL;