You are given two integers a and b. Determine if a+b=15 or a\times b=15 or neither holds.  Note that a+b=15 and a\times b=15 do not hold at the same time.
a, b = map(int, input().split())

aplusb = a + b
ab = a * b

if aplusb == 15:
    print("+")
if ab == 15:
    print("*")
else:
    print("x")
a, b = map(int, input().split())

aplusb = a + b
ab = a * b

if aplusb == 15:
    print("+")
elif ab == 15:
    print("*")
else:
    print("x")
