#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
int main(void)
{
    long long int point1,point2;
    char name1[200]="",name2[200]="",a;
    scanf("%s %lld %c\n",&name1,&point1,&a);
    scanf("%s %lld %c",&name2,&point2,&a);
    if(point1>point2)
    {
        printf("%s",name1);
    }
    else if(point1==point2)
    {
        printf("-1");
    }
    else
    {
        printf("%s",name2);
    }
    
}