A, B = (int(x) for x in input().split())
def wait():
    print(A)
    if A == B:
        exit()
    b = int(input())
    if A == b:
        exit()
    return b

def parse(X):
    i = 0
    j = 0
    while X % 2 == 0:
        i += 1
        X //= 2
    while X % 5 == 0:
        j += 1
        X //= 5
    return i, j

ai, aj = parse(A)

while ai < 7:
    ai += 1
    A *= 2
    B = wait()
while ai > 7:
    ai -= 1
    A //= 2
    B = wait()
while aj < 9:
    aj += 1
    A *= 5
    B = wait()

bi, bj = parse(B)
if (ai + aj + bi + bj) % 2 == 0:
    ai = 9
    A *= 4
    B = wait()
else:
    for _ in range(2):
        ai += 1
        A *= 2
        B = wait()
bi, bj = parse(B)

while True:
    while ai - bi > aj - bj:
        ai -= 1
        A //= 2
        B = wait()
        bi, bj = parse(B)
    while ai - bi < aj - bj:
        aj -= 1
        A //= 5
        B = wait()
        bi, bj = parse(B)