N, M = map(int, input().split())
A = list(map(int, input().split()))
P = list(map(int, input().split()))
dp = [[0] * (M + 1) for _ in range(N + 1)]
dp[0][0] = 1
for i in range(N):
    for j in range(M + 1):
        dp[i + 1][j] |= dp[i][j]
        if j - A[N - 1 - i] >= 0:
            dp[i + 1][j] |= dp[i][j - A[N - 1 - i]]
            
if dp[N][M] == 0:
    print(-1)
    exit()
    
now = -1
inf = 10 ** 18
val = M
temp = inf
ans = []
ind = -1
while val:
    for i in range(now + 1, N):
        if val - A[i] < 0:
            continue
        if dp[N - i - 1][val - A[i]]:
            if P[i] < temp:
                temp = P[i]
                ind = i + 1
                
    val -= A[ind - 1]
    ans.append(ind)
    temp = inf
    now = ind - 1
    
print(len(ans))
print(*ans)