class Math:
    @staticmethod
    def abs(x):
        if x >= 0:
            return x
        else:
            return x * -1

    @staticmethod
    def pow(a, b):
        if b == 0:
            return 1
        if b == 1:
            return a
        tmp = 1
        for i in range(b):
            tmp *= a
        return tmp


print(Math.abs(-9))
print(Math.pow(8, 2))