#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int nr=0,nrl=0,nrlc,s,nrcuv;
//ok=0 corespunde unui separator
//ok=1 corespunde unui cuvant
char c;
int main()
{ 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;
}