# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	S1, P1, X1 = list(input().split())
	S2, P2, X2 = list(input().split())
	P1 = int(P1); P2 = int(P2)
	if P1 == P2:
		print(-1)
	elif P1 > P2:
		print(S1)
	else:
		print(S2)



if __name__ == '__main__':
	main()