Stones_on_the_table.cpp

#include<bits/stdc++.h>
using namespace std;

int32_t main(){

    int n;
    cin>>n;
    string stones;
    cin>>stones;
    
    int count=0;
    for(int i=0;i<n;i++){
        if(stones[i]==stones[i+1]) count++;
    }
    cout<<count;

    return 0;
}