A_name, A_point = [int(i) if i.isnumeric() else i for i in input().split()][:2]
B_name, B_point = [int(i) if i.isnumeric() else i for i in input().split()][:2]
if A_point>B_point:print(A_name)
elif A_point<B_point:print(B_name)
else:print(-1)