def anagram(s1, s2):
    check = 0
    check |= 1 << len(s1)
    try:
        if check & 1 or not check & (1 << len(s2)):  # one of s1 or s2 is empty. or they have different length
            raise Exception()

        check &= 0  # reset check
        for c in s1:
            check |= 1 << ord(c)  # shift left for each char

        for c in s2:
            if not check & (1 << ord(c)):  # char does not exists
                print(c)
                raise Exception()
    except:
        return False
    else:
        return True

print(anagram("listen", "silent"))
print(anagram("lsisten", "silents"))