@staticmethod
def b():
    (a, b, c) = map(int, sys.stdin.readline().split())
    (f1, f2) = (((a + b) == c), ((a - b) == c))
    if (f1 & f2):
        print('?')
    elif (f1 & (~ f2)):
        print('+')
    elif ((~ f1) & f2):
        print('-')
    else:
        print('!')
@staticmethod
def b():
    (a, b, c) = map(int, sys.stdin.readline().split())
    (f1, f2) = (((a + b) == c), ((a - b) == c))
    if (f1 & f2):
        print('?')
    elif (f1 & (~ f2)):
        print('+')
    elif ((~ f1) & f2):
        print('-')
    else:
        print('!')