# https://yukicoder.me/problems/no/2881



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

    if X == Y:
        print(0)
        print("".join(map(str, [])))
    else:
        y = Y
        y_array = []
        while y > 0:
            y_array.append(y % 2)
            y //= 2
        y_array.reverse()

        if len(y_array) == 0 or y_array[-1] == 0:
            print(-1)
            return

        A = [N]
        index = 0
        while index < len(y_array) - 1:
            i = 0
            while index + i + 1 < len(y_array) and y_array[index + i + 1] == 0:
                i += 1
            
            A.append(i + 1)
            index += i + 1
        print(len(A))
        print(" ".join(map(str, A)))

        

        






        










if __name__ == "__main__":
    main()