#include <bits/stdc++.h>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int ok(char x)
{
    if((x>='a'&&x<='z')||(x>='A'&&x<='Z'))
        return 1;
    return 0;
}
string s;
int last_letter,words,length,i;
int main()
{  last_letter=-5;
    words=0;
    length=0;
   while(getline(f,s))
   {

    for(i=0; i<s.size();i++)
       {
            if(ok(s[i]))
        {
            if(last_letter!=i-1)
                words++;

            length++;

            last_letter=i;
        }
       }
   }


       // g<<i;

 //g<<words<<" ";
  //g<<length<<" ";
    g<<length/words;
    return 0;
}