#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define ov4(a, b, c, d, name, ...) name
#define rep3(i, a, b, c) for (ll i = (a); i < (b); i += (c))
#define rep2(i, a, b) rep3(i, a, b, 1)
#define rep1(i, n) rep2(i, 0, n)
#define rep0(n) rep1(aaaaa, n)
#define rep(...) ov4(__VA_ARGS__, rep3, rep2, rep1, rep0)(__VA_ARGS__)
const ll INF = LLONG_MAX / 4;
template <class T>
using vc = vector<T>;
template <class T>
using vvc = vc<vector<T>>;
void solve() {
    ll k, l;
    cin >> k >> l;
    if (l >= 2000) {
        cout << -1 << endl;
        return;
    }
    vc<ll> res(1999);
    ll v1 = k / 1998, v2 = k % 1998;
    res[1997] = v2 - 1998;
    res[1998] = 1998 - v2 + 1 + v1;
    cout << 1999 << endl;
    for (auto x : res) cout << x << " ";
    cout << endl;
}
int main() {
    cin.tie(0)->sync_with_stdio(0);
    cout << fixed << setprecision(20);
    ll t = 1;
    cin >> t;
    for (int i = 1; i <= t; i++) solve();
}