# No.201 yukicoderじゃんけん
sA, pA, xA = [s for s in input().split()]
sB, pB, xB = [s for s in input().split()]

pA = int(pA)
pB = int(pB)

if pA > pB:
    print(sA)
elif pA < pB:
    print(sB)
else:
    print(-1)