#include <iostream>
#include <fstream>
#include <string.h>
#include <ctype.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char sir[100001],*p;
int main()
{
    int nrcuv,nrlit,i;
    nrcuv=0;
    nrlit=0;
    while(!f.eof())
    {
        f.getline(sir,100001);
        for(i=0;i<=strlen(sir);i++)
        {
            if(isalpha(sir[i]))
                nrlit++;
            if(isalpha(sir[i-1]) && !isalpha(sir[i]))
                nrcuv++;
        }
    }
    g<<nrlit/nrcuv;