#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 1000000007
void solve(){
ll n , m, a = 0, b = 0;
cin >> n >> m;
for(int i = 0 ; i <= n; i++){
ll j = m;
if(i > (n - 1) / 2){
j = min((i * ((m - 1) / 2)) / (i - (n - 1) / 2), m);
}
if(i + j > a + b){
a = i;
b = j;
}
}
cout << (a + b) << '\n';
for(int i = 0 ;i < n; i++){
for(int j = 0 ; j < m; j++){
if(j >= b){
cout << "+";
}
else if(i >= a){
cout << "-";
}
else{
if((j - (b - (m - 1) / 2) * i % b + b) % b < b - (m - 1) / 2){
cout << "+";
}
else{
cout << "-";
}
}
}
cout << '\n';
}
}
int main() {
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int tests = 1;
cin >> tests;
for(int i = 1; i <= tests; i ++){
solve();
}
}
