#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') || (s[i] >= 'A' && s[i] <= 'Z')){
           if(ok)
               words++;
            letters++;
            ok = false;
        }else{
            ok = true;
        }
    }
    
    g << letters / words;
    
    return 0;
}