kulki

#include <iostream>
#include <string>

using namespace std;

int search(char a, string s);

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    string s;
    cin >> n;
    cin.ignore(20, '\n');
    getline(cin, s);
    cout << search('z', s) + search('b', s) + search('c', s);
    return 0;
}

int search(char a, string s)
{
    int tmp = 0,
            max = 0;
    bool state = false;
    for (int i = 0; i < s.length(); i++)
    {
        if (s[i] == a)
        {
            tmp++;
            state = true;
            if (max < tmp)
            {
                max = tmp;
            }
        }
        else if (s[i] != a && state)
        {
            state = false;
            tmp = 0;
        }
    }
    return max;
}