N, X = (int(x) for x in input().split())
V = [int(x) for x in input().split()]
W = [int(x) for x in input().split()]

dp = [[(-1, -1, -1)] * (X + 1)]
dp[0][0] = (0, -1, -1)
for i in range(N - 1, -1, -1):
    ndp = dp[-1][:]
    for w in range(X - W[i], -1, -1):
        if dp[-1][w][0] == -1:
            continue
        if (
            ndp[w + W[i]][0] == -1
            or dp[-1][w][0] + V[i] > ndp[w + W[i]][0]
        ):
            ndp[w + W[i]] = (dp[-1][w][0] + V[i], i, dp[-1][w][1])
    dp.append(ndp)

result = []
for w in range(X, -1, -1):
    if dp[-1][w][0] == -1:
        continue
    target = dp[-1][w][1]
    while target != -1:
        if dp[-1][w][1] == target:
            result.append(target + 1)
            target = dp[-1][w][2]
            w -= W[dp[-1][w][1]]
        dp.pop()
    break

print(len(result))
print(*result)