#include <bits/stdc++.h>   using namespace std;   vector<int> a;   int k, t, n, mx;   string s;   int main() {     cin >> n >> k;     cin >> s;     for (int i = 0; i < s.size(); i++)       if (s[i] ==  . ) a.push_back(i);     for (int i = 0; i < a.size() - 1; i++) mx = max(mx, a[i + 1] - a[i]);     if (mx > k)       cout <<  NO ;     else       cout <<  YES ;   }   