#include<iostream>
#include<fstream>
#include<cstring>
#include<math.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    int i,q=0,nr=0,nr2=0;
   char v[1000002];
   f.getline(v,1000001);
   for(i=0;i<strlen(v);i++)
   {
       if((v[i]>=65&&v[i]<=90||v[i]>=97&&v[i]<=122))
       {
           if(q==0)
           {
                  q=1;
           nr++;
           }
        nr2++;
       }
       else
       if(!(v[i]>=65&&v[i]<=90||v[i]>=97&&v[i]<=122))
       q=0;
   }
   g<<nr2/nr;
}