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#include <bits/stdc++.h>
using namespace std;
#define fr(i,n) for(int i = 0; i < int(n); i++)

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    int t, n; cin >> t;
    cin.ignore();
    string s; cin >> s; int c = 0, ind, d = 0;
    char freq[26] = {0};
    cin.ignore();
    for (size_t i = 0; i < t; i++) {
        for (size_t j = i+1; j < t; j++) {
            if(s[j] == s[i])c++;
            else if(s[j] != s[i])
            {
              d += c;
              i = j; cout << " j: " << j << " d: " << d << " ";
              break;
            }
            if((s[j] == s[i]) && j == t-1)
            {
              d += c;
              i = j; cout << " j: " << j << " d: " << d << " ";
              break;
            }
        }
    }
    cout << d;
    return 0;
}