n, m = map(int, input().split())
A = list(map(int, input().split()))
P = list(map(int, input().split()))

dp = [[False] * (m + 1) for _ in range(n + 1)]
dp[n][0] = True

for i in range(n - 1, -1, -1):
    dp[i] = dp[i + 1].copy()
    a = A[i]
    for j in range(a, m + 1):
        dp[i][j] |= dp[i + 1][j - a]
        
if not dp[0][m]:
    print(-1)
    exit()
    
inv = [0] * n
for i, p in enumerate(P):
    inv[p - 1] = i

l = -1
ans = []
while m:
    for i in inv:
        if i <= l:
            continue
        a = A[i]
        if m >= a and dp[i][m] and dp[i + 1][m - a]:
            l = i
            ans.append(i + 1)
            m -= a
            break

print(len(ans))
print(*ans)