#include <bits/stdc++.h>
using namespace std;

/* TYPES  */
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vll vector<long long>
#define mii map<int, int>
#define si set<int>
#define sc set<char>

/* FUNCTIONS */
#define f(i,s,e) for(long long int i=s;i<e;i++)
#define trav(a, x) for (auto &a : x)
#define cf(i,s,e) for(long long int i=s;i<=e;i++)
#define rf(i,e,s) for(long long int i=e-1;i>=s;i--)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define mt make_tuple
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define rall(x) x.rbegin(), x.rend()

/* TESTING */
#define dbg(x) cout << #x << " = " << x << endl;
#define fastio ios::sync_with_stdio(false); cin.tie(NULL); // cout.tie(NULL);
#define cinx(array) for(auto& x : array) cin >> x;

/* CONSTANTS */
#define MOD 1000000007
#define INF 1e18

// Vector, set, string, const char
template <class Ch, class Tr, class Container>
basic_ostream <Ch, Tr> & operator << (basic_ostream <Ch, Tr> & os, Container const& x) {
   os << "{ ";
   for(auto& y : x) os << y << " ";
   return os << "}";
}

// map
template <class X, class Y>
ostream & operator << (ostream & os, pair <X, Y> const& p) {
   return os << "[ " << p.first << ", " << p.second << "]" ;
}

void solve(){
    int ans,x,n;
    scanf("%d%d",&k,&l);
    if(l>2000){
        printf("-1\n");
        return ;
    }
    bool flag=false;
    for(int i=2;i<=2000;i++){
        int mo=k%(i-1);
        x=i-1-mo;
        ans=x+(x+k)/(i-1);
//        if(i==2) printf("%d\n",ans);
        if(ans<=1000000){
            n=i;
            flag=true;
            break;
        }
    }
    if(!flag) printf("-1\n");
    else {
        printf("1999\n");
        for(int i=1;i<=1999-n;i++)
            printf("-1000000 ");
        for(int i=1999-n+1;i<=1997;i++)
            printf("0 ");
        printf("%d ",-x);
        printf("%d\n",ans);
    }
}

int main(){
   fastio;

   int t;
   cin >> t;

	while(t--){
      solve();
	}

   return 0;
}

answer.code: In function ‘void solve()’:
answer.code:57:19: error: ‘k’ was not declared in this scope
   57 |     scanf("%d%d",&k,&l);
      |                   ^
answer.code:57:22: error: ‘l’ was not declared in this scope
   57 |     scanf("%d%d",&k,&l);
      |                      ^