#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;


int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int n;
    cin>>n;
    string s;
    cin>>s;
    int ans = 0;
    char c = 'a';
    for(int i = 0;i<n;i++){
        if(s[i]==c) continue;
        c = s[i];
        ans++;
    }
    cout<<ans<<endl;
}