X, Y = map(int, input().split())

if X == Y:
    print(4, flush=True)
    print(X, Y, X, Y, flush=True)

    t = int(input())
    ans = set()

    for p00 in [0, 1]:
        for p01 in [0, 1]:
            for p10 in [0, 1]:
                for p11 in [0, 1]:
                    P = [[p00, p01], [p10, p11]]

                    if P[P[P[X][Y]][X]][Y] == t:
                        ans.add(P[X][Y])

    if len(ans) == 1:
        print(*ans)

    exit()
else:
    print(4, flush=True)
    print(X, Y, Y, Y, flush=True)

    t = int(input())
    ans = set()

    for p00 in [0, 1]:
        for p01 in [0, 1]:
            for p10 in [0, 1]:
                for p11 in [0, 1]:
                    P = [[p00, p01], [p10, p11]]

                    if P[P[P[X][Y]][Y]][Y] == t:
                        ans.add(P[X][Y])

    if len(ans) == 1:
        print(*ans)

    exit()

# def test(a):
#     for p00 in [0, 1]:
#         for p01 in [0, 1]:
#             for p10 in [0, 1]:
#                 for p11 in [0, 1]:
#                     P = [[p00, p01], [p10, p11]]

#                     r = P[a[0]][a[1]]

#                     for i in range(2, len(a)):
#                         r = P[r][a[i]]

#                     if r != P[0][1]:
#                         return False

#     return True


# for l in range(3, 10):
#     for i in range(1 << l):
#         a = []

#         for j in range(l):
#             if (i >> j) & 1 == 1:
#                 a.append(1)
#             else:
#                 a.append(0)

#         if test(a):
#             print(*a)
#             exit()