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B.cpp
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/*****
* __Bismillahir Rahmanir Rahim__
* American International University Bangladesh (AIUB)
* Hadiur Rahman Nabil
*****/
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(void)
{
int n,t;
cin>>n>>t;
string s;
cin>>s;
for(int i=0;i<t;i++)
{
for(int j=0;j<s.size()-1;j++)
{
if(s[j]=='B' && s[j+1]=='G')
{
s[j]='G';
s[j+1]='B';
j++;
}
}
}
cout<<s<<endl;
}