#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char s,aux;
int main()
{
    int c,l=0;
    c=0;
    while(!fin.eof())
     {
         fin.get(s);
         if((s>=65&&s<=90)||(s>=97&&s<=122))
             l++;
             else if((aux>=65&&aux<=90)||(aux>=97&&aux<=122))
                c++;
             aux=s;

     }
     if((s>=65&&s<=90)||(s>=97&&s<=122))
     c++;
     fout<<l/c;
    return 0;
}