#include <bits/stdc++.h>
using namespace std;
int main() {
    int N, M; cin >> N >> M;
    assert(N <= 25);
    vector<int> A(N), P(N);
    for (int i=0; i<N; ++i) cin >> A[i];
    for (int i=0; i<N; ++i) cin >> P[i];
    vector<int> B, H{N + 1};
    for (int i=0; i<(1<<N); ++i) {
        int sum = 0;
        vector<int> C, D;
        for (int j=0; j<N; ++j) {
            if ((i>>j) & 1) {
                sum += A[j];
                C.push_back(j);
                D.push_back(P[j]);
            }
        }
        if (sum == M && D < H) {
            B = C;
            H = D;
        }
    }
    if (B.empty()) puts("-1");
    else {
        cout << B.size() << endl;
        for (int i=0; i<B.size(); i++) cout << B[i] + 1 << " \n"[i == B.size()];
    }
}