266A - Stones on the Table

#include <iostream>
#include <string>
using namespace std;
int main() {
int n;
int cnt=0;
string s;
cin>>n;
cin>>s;

for(int i=0;i<s.size();i++){
    if(s[i]==s[i+1])
    { cnt++;
     }
}
cout<<cnt;

   

    return 0;
}