#coding: UTF-8

import sys
import re
import itertools
from collections import deque

### defs ###


### main ###
Sa,Pa,Xa=sys.stdin.readline().split()
Sb,Pb,Xb=sys.stdin.readline().split()
Pa = int(Pa)
Pb = int(Pb)
if (Pa>Pb):
	print(Sa)
elif(Pb>Pa):
	print(Sb)
else:
	print(-1)