#include <iostream>
#include<fstream>
using namespace std;
int nr,nr1,ok,nrlc,nrcuv,s;
char c;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    while(!f.eof())
    {
        f.get(c);
        if(c>='a' && c<='z'|| c>='A' && c<='Z')
        nrlc++;
        else
        {
            s=s+nrlc;
            if(nrlc!=0) nrcuv++;
           nrlc=0;
        }

    }

   g<<s/nrcuv;
    return 0;
}