T=int(input())
for i in range(T):
    s = input().split()
    head = int(s[0])
    foot = int(s[1])
    rabbit=foot/2-head
    chicken=2*head-foot/2
    if rabbit>0 and chicken>0 and rabbit.is_integer():
        print(int(chicken),int(rabbit))
    else:
        print('-1')