#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long n, t;
  cin >> n >> t;
  string s;
  cin >> s;
  while (t--) {
    for (long long j = 1; j < n; j++) {
      if (s[j - 1] == 'B' && s[j] == 'G') {
        swap(s[j - 1], s[j]);
        j++;
      }
    }
  }
  cout << s << endl;
  ;
}
