#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;

int main()
{
    ifstream f ("text.in");
    ofstream g ("text.out");
   char s[10000],sep[]=" -+&%$#@)(?!;:'*~`|][}{=><,.",*p,l[]="qwertyuioplkjhgfdsazxcvbnmQWERTYUIOPLKJHGFDSAZXCVBNM";
   f.getline(s,10000);
   int i,k=0,m=0,z;
   for (i=0;i<strlen(s);i++)
       {
           if (strchr(l,s[i]));
            m++;
       }
   p=strtok(s,sep);
   while (p)
   {
       k++;

       p=strtok(NULL,sep);
   }
   z=m/k;
   g<<z;
   g.close();
}