from itertools import pairwise

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

if Y % 2 == 0:
    if X == Y:
        print(0)
        print()
    else:
        print(-1)
    exit()

op = []
op.append(N)

idxes = [i + 1 for i in range(N) if (Y >> i) & 1][::-1]

for next_i, curr_i in pairwise(idxes):
    op.append(next_i - curr_i)

print(len(op))
print(*op)

# test
_x = X
print(_x)
for cmd in op:
    _x = (_x * 2**cmd + 1) % 2**N

assert _x == Y, f"{_x=}, {Y=}"