#include <iostream>
#include <fstream>
#include <string>

std::ifstream f("text.in");
std::ofstream g("text.out");

int words,letters;
bool ok;
std::string s;

int main(){
    
    std::getline(f,s);
    
    for(int i = 0;i < s.size();++i){
        
        if(s[i] >= 'a' && s[i] <= 'z'){
            letters++;
            ok = true;
        }else if(ok == true){
            words++;
            ok = false;
        }
    }
    
    g << letters / words;
    
    return 0;
}