#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char ch;
int l,nrcuv;
int main()
{
  while(f.get(ch))
    if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z')) l++;
    else if (ch==' ') nrcuv++;


    nrcuv++;
 g<<l/nrcuv;
    return 0;
}