#include <iostream>
#include <ctype.h>
#include <fstream>
#include <cstring>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s;
int nrl=0,nrcuv=0;
int main()
{
    while(f.get(s))
    {
        if(isalpha(s))
        {
            nrcuv++;
            while(isalpha(s))
            {
                f.get(s);
                nrl++;
            }

        }

    }
    g<<nrl/nrcuv<<endl;


    return 0;
}