#include<fstream>
#include<iostream>
#include<string.h>
#include<math.h>
using namespace std; 
char s[100];
int main()
{
   ifstream f("text.in");
   ofstream g("text.out");
    int cuv=0,lit=0,lungime=0;
   f.getline(s,100);
   lungime=strlen(s);
   s[lungime]='.';
   for(int i=0;i<=lungime;i++)
   if(islower(s[i]) || isupper( s[i]))
   {
       lit++;
       if((s[i+1]<'a' || s[i+1]>'z') && (s[i+1]<'A' || s[i+1]>'Z'))      
       cuv++;
   }
   //cout<<lit<<endl<<cuv;
   g<<floor(lit/cuv);
 // system("pause");
   return 0;
   }