#include <iostream>

using namespace std;

int countLetters(string s, char c) {
    int r = 0;
    for (int i = 0; i < s.size(); ++i) {
        if (s[i] == c) {
            r++;
        }
    }
    return r;
}

int main() {
    cout << countLetters("hello", 'l') << endl;
}

//g++ 561py.cpp -o 561py.exe && 561py.exe