parkour.cpp

// NOTE: it is recommended to use this even if you don't understand the following code.

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
    // uncomment the two following lines if you want to read/write from files
    // ifstream cin("input.txt");
    // ofstream cout("output.txt");

    int N, M;
    cin >> N >> M;

    // INSERT YOUR CODE HERE
    if (N > M) {
        cout << -1 << endl;
    } else {
        for (int i=0; i<N; i++) {
            for (int j=0; j<i; j++) {
                cout << '#';
            }
            for (int j=i; j<M; j++) {
                cout << '.';
            }
            cout << endl;
        }
    }


    return 0;
}