#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char c;
int nr=0, nrl=0,ok=0,nrlc,nrcuv,s;
///ok=0 corespunde unui separator si ok==1 corespunde unei litere
int main()
{
    while(!f.eof())
    {
        f.get(c);
        if(c>='a'&&c<='z' || c>='A'&&c<='Z')
            nrlc++;


        else
        {

            s=s+nrlc;
            nrlc=0;

    }
}
g<<s/nrcuv;
    return 0;
}