#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<ll, ll>
#define fi first
#define sec second
#define ld long double
const int MAXN = 1e5;
const ll INF = 1e18;
const int MOD = 1e9 + 7;
int main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int tc = 1;
cin >> tc;
for(;tc--;){
ll N, M; cin >> N >> M;
vector<ll> cur(M + 5, N);
ll ans = M;
ll rows = M, pt = 0;
for(int i = 1; i <= N; i++){
sort(cur.begin() + 1, cur.begin() + 1 + M);
for(int j = 1; j <= M / 2 + 1; j++){
cur[j]--;
if(cur[j] == N / 2) rows--;
}
if(ans < rows + i){
ans = rows + i;
pt = i;
}
}
vector<vector<char>> grid(N + 5, vector<char>(M + 5));
for(int i = 1; i <= N; i++){
for(int j = 1; j <= M; j++) grid[i][j] = '-';
}
vector<pii> now;
for(int i = 1; i <= M; i++) now.push_back({N, i});
for(int i = 1; i <= pt; i++){
sort(now.begin(), now.end());
for(int j = 0; j < M / 2 + 1; j++){
grid[i][now[j].sec] = '+';
now[j].fi--;
}
}
cout << ans << "\n";
for(int i = 1; i <= N; i++){
for(int j = 1; j <= M; j++) cout << grid[i][j];
cout << "\n";
}
}
}
/*
*/
