#include <iostream>
#include <fstream>
#include <string>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int cuvinte,litere;
int fr[100001];
string linie;
int main()
{
    getline(in, linie);
    if(isalpha(linie[0])) cuvinte++;
    for(size_t i=1;i<=linie.length();i++)
    {
        if((isalpha(linie[i])) && (!isalpha(linie[i-1]))) cuvinte++;
        if(isalpha(linie[i])) litere++;
    }
    out<<litere/cuvinte;
    return 0;
}