#include <bits/stdc++.h>   using namespace std;   struct city_t : array<bitset<99>, 4> {     int n, k, m, p;     city_t() { cin >> n >> k, m = n / 2, p = n - 2; }     void hotel(int i, int j) {       if (!(*this)[i][j] && k > 0) (*this)[i][j] = true, k--;     }     void solve() {       if (k % 2) hotel(1, m);       for (int i = 1; i < 3 && k > 0; i++)         for (int u = 1, v = p; v > u && k > 0; u++, v--) hotel(i, u), hotel(i, v);       hotel(1, m), hotel(2, m);     }     void write() {       cout <<  YES ;       for (int i = 0; i < 4; i++) {         cout <<   n ;         for (int j = 0; j < n; j++)           if ((*this)[i][j])             cout <<  # ;           else             cout <<  . ;       }     }   };   int main() {     ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);     city_t city;     city.solve(), city.write();   }   