#include <iostream>
#include<fstream>
#include<cstring>
using namespace std;
char sir[101];
int estelitera(char c){
if((c>='a'&&c<='z')||(c>='A'&&c<='Z')){
    return 1;
}
return 0;
}
int numar_cuvinte(char sir[101]) {
  int n = strlen(sir);
  int am_cuvant = 0;
  int numar_cuvinte = 0;
  for (int i = 0; i < n; ++i){
    if (estelitera(sir[i])){
      am_cuvant = 1;
    }
    else if (am_cuvant = 1) {

      ++numar_cuvinte;
      am_cuvant = 0;
    }
  }
  if (am_cuvant) {
    ++numar_cuvinte;
  }

  return numar_cuvinte;
}
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    f.getline(sir,100);
    int lg=strlen(sir);
    int r=0;
    int s=0;
    for(int i=0;i<lg;++i){
        if(estelitera(sir[i])){
            r=r+1;
        }
if(estelitera(sir[i])==0&&sir[i]!=char(32)){
        ++s;
}

    }
    if(estelitera(sir[lg-1])==0){
        s=s-1;
    }
g<<r/(numar_cuvinte(sir)-s);
    return 0;
}