#include <bits/stdc++.h>
using namespace std;
template<typename T>
void out(T x) { cout << x << endl; exit(0); }
#define watch(x) cout << (#x) << " is " << (x) << endl
using ll = long long;
const int maxn = 1e6 + 5;
void solve() {
int n,m;
cin>>n>>m;
int op1 = n+(m+1)/2-1;
int op2 = (n+1)/2-1+m;
if (op1>op2) {
cout<<op1<<"\n";
string s;
while (int(s.length()+s.length()) <= m) {
s += '+';
}
while ((int)s.length()<m) s += '-';
for (int i=0; i<n; i++) {
cout<<s<<"\n";
}
} else {
cout<<op2<<"\n";
int rows = 0;
for (int i=0; i<n; i++) {
if (rows+rows>n) {
cout<<string(m,'-')<<"\n";
} else {
cout<<string(m,'+')<<"\n";
rows++;
}
}
}
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
int t;
cin>>t;
while (t--) solve();
return 0;
}
