This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define pb push_back
#define LL long long
#define Kultivator ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;
const LL Mxn = 1e6 + 7;
const LL Mod = 1e9 + 7;
const LL Inf = 1e14 + 7;
int main(){
    Kultivator;
    int tt;
    cin >> tt;
    while(tt--){
        int N, M;
        cin >> N >> M;
        if(N == M){
            cout << N + max(0, (N / 2) - 1) << '\n';
            for(int i = 1; i <= N; i++){
                for(int j = 1; j <= M; j++){
                    if(i > (N / 2) + 1){
                        cout << '-';
                    } else {
                        cout << '+';
                    }
                }
                cout << '\n';
            }
        }
        cout << '\n';
    }
}
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