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import java.io.*;

import java.util.*;

public class SchoolQueue {

public static void main(String[] args) throws IOException {

BufferedReader f =new BufferedReader(new InputStreamReader(System.in));

StringTokenizer st = new StringTokenizer(f.readLine());

int n = Integer.parseInt(st.nextToken());

int t = Integer.parseInt(st.nextToken());

char[] children = f.readLine().toCharArray();

while (t-- > 0) {

for (int i = 1; i < n; i++) {

if (children[i - 1] == 'B' && children[i] == 'G') {

children[i - 1] = 'G';

children[i] = 'B';

i++;

}

}

}

System.out.println(new String(children));

}

}