#include<fstream>
#include<string.h>
using namespace std;
int main()
{
    int i, cuvant=0, litere=0 ;
    char c, dinainte='#';
    ifstream in("text.in");
    ofstream out("text.out");
    while(in.get(c))
    {if ((c>='a' && c<='z')||(c>='A' && c<='Z')) 
         { litere++;
          if(dinainte<'A'||(dinainte>'Z' && dinainte<'a')||dinainte>'z' || dinainte==' ')
            cuvant++;}
      dinainte=c;}
           out<<(litere/cuvant);
           return 0;
       
}