Codeforces_266A

//Codeforces Round 266A
#include <string>
#include <cstring>
#include <iostream>
using namespace std;
int main()
{
    int n, answ=0, ch=0;
    string s;
    char mass[51];
    cin >> n >> s;
    strcpy(mass, s.c_str());
    for(int i=0;i<n;i++)
    {
        if(mass[i]==mass[i+1])
        {
            answ++;
        }
    }
    cout << answ;
    return 0;
}