#include <bits/stdc++.h>   using namespace std;   char arr[50][50];   int main() {     int n, m;     cin >> n >> m;     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) {         if ((i % 2 == 0 ||              ((i % 4 == 1 && j == m - 1) || (i % 4 == 3 && j == 0))))           arr[i][j] =  # ;         else           arr[i][j] =  . ;       }     for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) cout << arr[i][j];       cout <<   n ;     }   }   