#include<stdio.h>
int v[3003], w[3003];
int dp[3003][3003];
int ans[3003], aa;
int main()
{
	int n, W;
	scanf("%d %d", &n, &W);
	int i, j, k;
	for (i = 0; i < n; i++)
		scanf("%d", &v[i]);
	for (i = 0; i < n; i++)
		scanf("%d", &w[i]);
	for (j = 0; j <= W; j++)
		dp[n][j] = 0;
	for (i = n - 1; i >= 0; i--)
	{
		for (j = 0; j <= W; j++)
			dp[i][j] = dp[i + 1][j];
		for (j = 0; j + w[i] <= W; j++)
			if (dp[i][j] < v[i] + dp[i + 1][j + w[i]])
				dp[i][j] = v[i] + dp[i + 1][j + w[i]];
	}
	aa = 0;
	int V = dp[0][0], R = 0, f;
	for (k = -1; V > 0;)
	{
		for (i = k + 1; dp[i][R] == V; i++);
		k = i - 1;
		ans[aa++] = k + 1;
		V -= v[k];
		R += w[k];
	}
	printf("%d\n", aa);
	for (i = 0; i < aa - 1; i++)
		printf("%d ", ans[i]);
	printf("%d\n", ans[i]);
	return 0;
}