A. Stones on the Table Solution

#include<bits/stdc++.h>

using namespace std;

int main()

{

    string s;

    int n;

    cin>>n>>s;

        int total=0;

    for(int i=0;i<n-1;i++){

        if (s[i] == s[i+1]){

            total++;

        }

    }

    cout<<total<<endl;

    return 0;

}