import sys
input = sys.stdin.readline

N,M=map(int,input().split())
A=list(map(int,input().split()))
P=list(map(int,input().split()))

DP=[[0]*(M+1) for i in range(N+1)]
DP[N][M]=1

for i in range(N-1,-1,-1):
    a=A[i]
    for j in range(M+1):
        if DP[i+1][j]==1:
            DP[i][j]=1
            if j-a>=0:
                DP[i][j-a]=1

Q=[(P[i],i) for i in range(N)]
Q.sort()

now=0
last=-1
ANS=[]
while now!=M:
    for _,i in Q:
        if i<=last:
            continue
        a=A[i]
        if now+a<=M and DP[i+1][now+a]==1:
            ANS.append(i+1)
            now+=a
            last=i
            break
    else:
        break

if now==M:
    print(len(ANS))
    print(*ANS)
else:
    print(-1)