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include <bits/stdc++.h>

using namespace std ;

define ll long long

int main() { string s; cin>>s; int t; cin>>t; for( int i=0; i<t* s.size(); i++){ if( s[i] =='B' and s[i+1]=='G'){ s[i] = 'G'; s[i]='B' ;}

}
COUT<<


return 0;

}