#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b;
  cin >> a >> b;
  string s;
  cin >> s;
  while (b--) {
    for (int i = 0; i < a - 1; i++) {
      if (s[i] == 'B' && s[i + 1] == 'G') {
        int t;
        t = s[i];
        s[i] = s[i + 1];
        s[i + 1] = t;
        i++;
      }
    }
  }
  cout << s;
  return 0;
}
