#include <iostream>
#include <fstream>
#include <string>
#include <ctype.h>
using namespace std;

string s;
unsigned long long lit=0,cuv=0,i=0;
int p=0;
int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
    getline(in,s);

    while(i<s.size()){
        while(!isalpha(s[i])&&i<s.size()) i++;

        while(isalpha(s[i])&&i<s.size()) {lit++; i++;}
        cuv++;

        i++;
    }

    out<<lit/cuv;

    return 0;
}