#include <iostream>
#include <cstring>
#include <fstream>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

string str;
int cont = 0, nr = 0, n;


int main(){
int i = 0;
    getline(fin, str);
    n = str.size();
    while(i < n){
        //cout << "i: " << i << ", str: " << str[i] << "\n";
        if((str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z')){
            nr++;
            while((str[++i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z')){ 
                nr++;
                //cout << "i2: " << i << ", str: " << str[i] << "\n";
            }
            cont++;
        }
        i++;
    }
    //cout << "nr: " << nr << ", cont: " << cont << "\n";
    fout << nr/cont ;
    return 0;
}