from typing import List


def carrylessAdd(x: int, y: int) -> int:
    """Add two numbers without carrying."""
    pos: List[int] = []
    while x > 0 or y > 0:
        sum = (x % 10 + y % 10) % 10
        pos.append(sum)
        x //= 10
        y //= 10
    num = 0
    for idx, val in enumerate(pos):
        num += val * 10**idx
    return num


print("Testing carrylessAdd()...", end="")
assert carrylessAdd(8, 7) == 5
assert carrylessAdd(785, 376) == 51
assert carrylessAdd(0, 325) == 325
assert carrylessAdd(30, 873) == 803
assert carrylessAdd(873, 30) == 803
assert carrylessAdd(100, 11) == 111
print("Passed!")