#include <fstream>
#include <string>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char a;
int cuvant,litere,k;
int main()
{  f>>a; 
	while(f>>a)  {  
	                 if((a>='a' && a<='z') || (a>='A' && a<='Z')) { 
	                                                            litere++;
																if(k==0) { cuvant++; 
																		   k=1;
																		}
                                                                  }
					else if (a=='-' && k==1) cuvant++;
					     else k=0;
					
                 }

 g<<litere/cuvant;
 f.close();
  g.close();
  return 0;
}