#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int i,j,nr1=0,nr2=0;
char s[1000001],litere[]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPRSTUVWXYZ";
int main()
{
    f.get(s,1000001);
   int nr=0;
  for(i=0;s[i]!=0;i++)
      if(strchr(litere,s[i])!=0)          // incepe un cuvant
      {
         j=i;
        while(strchr(litere,s[j])!=0&&s[j]!=0){
            j++;nr1++;}
        nr2++;
        i=j-1;
      }
  g<<nr1/nr2;

  return 0;}