import sys
input = sys.stdin.readline
from math import gcd

T=int(input())
for tests in range(T):
    A,B=map(int,input().split())
    ANS=[]
    while A!=B:
        ANS.append(gcd(A,B))
        A+=gcd(A,B)
    print(len(ANS))
    print(*ANS)