#include<fstream>
#include<string.h>
using namespace std;
int main()
{
    int i, cuvant=0, litere=0 ;
    char s[1000], dinainte='#';
    ifstream in("text.in");
    ofstream out("text.out");
    in.getline(s,1000);
    for(i=0;i<strlen(s);i++)
    {if ((s[i]>='a' && s[i]<='z')||(s[i]>='A' && s[i]<='Z')) 
         { litere++;
          if(dinainte<'A'||(dinainte>'Z' && dinainte<'a')||dinainte>'z' || dinainte==' ')
            cuvant++;}
      dinainte=s[i];}
           out<<(litere/cuvant);
           return 0;
       
}