#include <fstream>
#include <string.h>

using namespace std;

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

int main()
{ char a;
  int nr_lit=0,cuv=0,ok=0;
  do{
     a = f.get();
     if(isalpha(a))
        {++nr_lit;
          if(!ok) {++cuv;++ok;}
        }
     else ok = 0;

  }while(!f.eof());
  g<<nr_lit/cuv;
  f.close();
  g.close();
    return 0;
}