#include <bits/stdc++.h>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

char *p,s[1000000],v[] = " !@#$%^&*()_-+={}[]';:/.,><?";
int medie,cate;

int main()
{
   f.getline(s,1000000);
   p = strtok(s,v);
   while(p)
   {
       medie += strlen(p);
       ++ cate;
       p = strtok(NULL,v);
   }
   if(cate)
    g << medie / cate;
   else
    g << 0;
}