def main():
    N, W = map(int, input().split())
    VALUES = list(map(int, input().split()))
    WEIGHTS = list(map(int, input().split()))
    
    scores = [[-1] * (W + 1) for _ in range(N + 1)]
    paths = [[] for _ in range(W + 1)]
    
    scores[0][0] = 0
    for i in range(N):
        v = VALUES[i]
        added_w = WEIGHTS[i]
        
        for w in range(W + 1):
            if scores[i][w] != -1:
                scores[i + 1][w] =  scores[i][w]
        
        for w in range(W + 1):
            new_w = w + added_w
            new_score = scores[i][w] + v
            if new_w <= W and scores[i + 1][new_w] <= new_score and paths[new_w] < paths[w] + [i + 1]:
                scores[i + 1][new_w] = new_score
                paths[new_w] = paths[w] + [i + 1]
    
    path = []  
    for w in reversed(range(W + 1)):
        if scores[-1][w] != -1:
            path = paths[w]
            break
    
    print(len(path))
    print(*path)
                
if __name__ == "__main__":
    main()