from Queue import * # Queue, LifoQueue, PriorityQueue
from bisect import * #bisect, insort
from collections import * #deque, Counter,OrderedDict,defaultdict
#set([]) 
import math
import copy
import itertools
import string
import sys
myread = lambda : map(int,raw_input().split())
def solver():
    Sa,Pa,Xa = raw_input().split()
    Sb,Pb,Xb = raw_input().split()
    Pa,Pb = int(Pa),int(Pb)
    if Pa < Pb:
        print Sb
    elif Pb < Pa:
        print Sa
    else:
        print -1


if __name__ == "__main__":
    solver()