#include <iostream>
#include <fstream>
using namespace std;

int main()
{
   char s;
   unsigned cuv=0, lit=0;
   ifstream f("text.in");
   ofstream g("text.out");
   while(f.get(s))
   {if((s>'a'&& s<'z')||(s>'A'&& s<'Z'))
        lit++;
    else cuv++;}
    g<<lit/cuv;

    return 0;
}