codeforce #163 div2

//cf #163 div 2 A
// http://codeforces.com/contest/266/problem/A
#include<stdio.h>
#include<iostream>
using namespace std;
char a[55];
int main(){
  int n,i;
  //freopen("input.txt","r",stdin);
  while(scanf("%d%*c",&n)!=EOF){
           int sum=0;
      for(i=0;i<n;i++)
       scanf("%c",a+i);
      for(i=0;i<n-1;i++)
        if(a[i]==a[i+1])
           sum++;
      printf("%d\n",sum);
  }
  return 0;
}

//cf #163 div 2 B
// http://codeforces.com/contest/266/problem/B
#include<stdio.h>
char a[100];
int main(){
   // freopen("input.txt","r",stdin);
 int n,t,i;
  while(scanf("%d%d",&n,&t)!=EOF){
     scanf("%s",a);
    while(t--){
     for(i=0;i<n;)
     if(a[i]=='B'&&a[i+1]=='G'){
        a[i]='G';
        a[i+1]='B';
        i+=2;
    }
    else i++;
}
    printf("%s\n",a);
}
 return 0;
}