import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")

#######################################################################
n,m = na()
A = na()[::-1]
P = na()[::-1]
Z = list(range(n-1,-1,-1))
q = []
q = sorted(q)
dp = [0 for i in range(n+1)]

dp[0] = 1
z = (1<<(m+1))-1
for i in range(n):
    p,a = P[i],A[i]
    dp[i+1] = (dp[i]<<a)|dp[i]
    dp[i+1] &= z
if (dp[-1]>>m&1)^1:
    print(-1)
    exit()
x = m
B = []
Q = [(P[i],A[i],Z[i],i) for i in range(n)]
Q = sorted(Q)
z = -1
for _ in range(n):
    for p,a,i,j in Q:
        if i <= z:
            continue
        #print(p,a,i,bin(dp[i+1]),bin(dp[i]))
        if x<a:
            continue
        if dp[j+1]>>x&1 and dp[j]>>(x-a)&1:
            B.append(i+1)
            z = i
            x-=a
            break

print(len(B))
print(*sorted(B))