#include <iostream>
#include <algorithm>
#include <string>
#include <vector>

int main() {
    std::string s;

    std::cin >> s;

    std::cout << std::min(std::count(s.begin(), s.end(), 'c') - 1, std::count(s.begin(), s.end(), 'w')) << std::endl;
    return 0;
}