def make_divisors(n):
    lower_divisors, upper_divisors = [], []
    i = 1
    while i**2 <= n:
        if n % i == 0:
            lower_divisors.append(i)
            if i != n // i:
                upper_divisors.append(n // i)
        i += 1
    return lower_divisors + upper_divisors[::-1]


T = int(input())
for _ in range(T):
    a, b = map(int, input().split())
    divs = make_divisors(a)
    ans = []
    while a < b:
        while a + divs[-1] > b:
            divs.pop()
        a += divs[-1]
        ans.append(divs[-1])
    assert a == b
    print(len(ans))
    print(*ans)