#include <bits/stdc++.h>

using namespace std;
string s;
int main() {
    cin >> s;
    for (int i = 0; i < s.size(); i++)
        if (s[i] >= 'A' && s[i] <= 'Z') s[i] += 32;
          
    int cnt = 0;
    for (int i = 0; i < s.size(); i++)
        if (s.substr(i, 4) == "lqbs") cnt++;

    cout << cnt << endl;
    return 0;
}