266A

266A

Program

#include <iostream>
#include <string>
 
using namespace std;
 
int main()
{
    ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
    
    int n,c=0;
    string s;
    
    cin >> n;
    cin >> s;
 
    for (int x = 0; x < n; x++) if (s[x] == s[x+1]) c+=1;
    
    cout << c << '\n';
    
    return 0;
}

input();s=list(input());c=0
for x in range(len(s)-1):
    if s[x]==s[x+1]:c+=1
print(c)

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