#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define ll long long
#define ld long double
#define pii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define prc(n) fixed << setprecision(n)
#define fastios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define pi acos(-1);
const int inf = 1e9+7;
const int N = 2000;
int n, m;
void solve(){
cin>>n>>m;
if(n == m){
cout<<n-1<<"\n";
for(int i=0;i<n-1;i++) cout<<1<<" ";
cout<<"\n";
return;
}
if(n % m == 0 && n > m){
cout<<n-1<<"\n";
for(int i=0;i<n-1;i++) cout<<-1<<" ";
cout<<"\n";
return;
}
if(m % n == 0 && m > n){
cout<<m-1<<"\n";
for(int i=0;i<m-1;i++) cout<<1<<" ";
cout<<"\n";
return;
}
return;
}
int main(){
fastios
int t = 1;
cin>>t;
while(t--) solve();
return 0;
}
