#include <fstream.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{
 int n=-1,i=-1,l=0,c=0;
 char sir[1000000];
 while (sir[n]!='\0')
 {
  ++n;
  f>>sir[n];
 }
 do
 {
  ++i;
  if (isalpha(sir[i])) ++l;
  else if (isalpha(sir[i+1])) ++c;

 }
 while (i<n-1);
 g<<l/c;
 return 0;
}