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

using namespace std;

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

string s;
int main()
{
    getline(fin,s);
    int n = s.size(),i,word_count = 0,letter_count = 0;

    for(i = 0; i < n; i ++)
    {
        if(isalpha(s[i]))
            {
                word_count ++;

                while(isalpha(s[i]) && i < n)
                    letter_count ++,i ++;
            }
    }

    fout << letter_count / word_count;

    return 0;
}