// Muallif: Mansuraliyev Husanboy Murotali o'g'li >> NamPS
#include<bits/stdc++.h>
using namespace std;
#define ios ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
const double PI=3.1415926535897932384626433832795;
// 0-9 >> 48-57; A-Z>>65-90 and a-z>>97-122 respectively;
int main()
{
int t; cin>>t;while(t--){
int n,m;cin>>n>>m;
int mx=max(n,m);
int mn=min(n,m);
if(mn%2==0) cout<<mx+(mn-1)/2<<"\n";else cout<<mx+mn/2<<"\n";
if(m==mx){
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
if(i<=n/2) cout<<"-";else cout<<"+";
}
cout<<"\n";
}
}else{
for(int i=0;i<n;i++){
for(int j=0;j<m;j++){
if(j<=m/2) cout<<"+";else cout<<"-";
}
cout<<"\n";
}
}
//cout<<endl;
}
}
