from typing import List


def carrylessMultiply(x: int, y: int) -> int:
    """Multiply 2 numbers without carrying"""
    str_a = str(x)[::-1]
    str_b = str(y)[::-1]

    max_len = len(str_a) + len(str_b)
    pos: List[int] = [0] * max_len
    for i in range(len(str_a)):
        for j in range(len(str_b)):
            pnt = i + j
            digit_a = int(str_a[i])
            digit_b = int(str_b[j])
            pos[pnt] += digit_a * digit_b
            pos[pnt] %= 10
    result_str = "".join(str(digit) for digit in pos[::-1]).lstrip("0") or "0"
    return int(result_str)


print("Testing carrylessMultiply()...", end="")
assert carrylessMultiply(3, 3) == 9
assert carrylessMultiply(4, 4) == 6
assert carrylessMultiply(12345, 0) == 0
assert carrylessMultiply(643, 59) == 417
assert carrylessMultiply(6412, 387) == 807234
print("Passed!")