#include<fstream>
#include<cstring>
#include<iostream>
using namespace std;
int main()
{char c;
 int cuv=0,lit=0,i;
 ifstream f("text.in");
 while (!f.eof())
 {c=f.get();
  if ((c>='a' && c<='z') || (c>='A'&& c<='Z'))
   lit++;
  if (c==' ' || c=='-')
	  cuv++;
 }
   
ofstream g("text.out");
cout<<lit/cuv;
f.close();
 g.close();
 return 0;
}