#include <bits/stdc++.h>   using namespace std;   const double pi = acos(-1.0);   const int dx[] = {0, 1, 0, -1};   const int dy[] = {1, 0, -1, 0};   int n, k;   string s;   int main() {     cin >> n >> k;     cin >> s;     int sum = 0;     for (int i = 0; i < n; i++) {       if (s[i] ==  # ) sum++;       if (sum >= k) {         puts( NO );         return 0;       }       if (s[i] ==  . ) sum = 0;     }     puts( YES );     return 0;   }   