#include<fstream>
#include<cstring>
#include<cctype>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
    char s[1000000];
	int n=0,k=0,i=0;
	bool in;
int main ()
{   //isalpha(s[i])-litera sau nu
	/*cout<<"introdu sirul:";
	cin.getline(s,90);
	cout<<"ati introdus sirul:"<<s<<endl;*/
	f.getline(s,1000000);
	for(i=1;s[i] !='\0'; i++)
    { if(isalpha(s[i]) && !(in))
        {n++;
         in= true;
		}
	  if(isalpha(s[i]))k++;
	  if(!isalpha(s[i]))in =false;
	}
	g<<k/n;
	f.close();
	g.close();
   /*	cout<<"sirul contine "<<n<<" cuvinte si "<<k<<" litere"<<endl;*/	
}