import sys
input = sys.stdin.readline

N,W=map(int,input().split())
A=list(map(int,input().split()))
B=list(map(int,input().split()))

DP=[0]*(W+1)
for i in range(N):
    a,b=A[i],B[i]

    for j in range(W-b,-1,-1):
        if DP[j+b]<DP[j]+a:
            DP[j+b]=DP[j]+a
            
MAX=max(DP)


DP2=[[] for i in range(N+1)]

DPX=[0]*(W+1)

for i in range(N-1,-1,-1):
    a,b=A[i],B[i]

    for j in range(W-b,-1,-1):
        if DPX[j+b]<DPX[j]+a:
            DPX[j+b]=DPX[j]+a

    DP2[i]=DPX[:]

NOW=MAX
ANS=[]
while NOW>0:
    for i in range(N-1,-1,-1):
        if DP2[i][-1]==NOW:
            ANS.append(i+1)
            NOW-=A[i]
            break

print(len(ANS))
print(*ANS)