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