#include <iostream>
#include <fstream>
#include <string.h>
#define NMax 60000001
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c;
int main ()
{
    unsigned long long cuv=0,litere=0,rez;
    bool ok=0;
    while (f.get(c))
    {
        while ((65<=c && c<=90) || (97<=c && c<=122)) {ok=1;f.get(c);litere++;}
        if (ok)
        {
            cuv++;
            ok=0;
        }
    }
    rez=litere/cuv;
    g<<rez;
}