#include<iostream>
#include<string.h>
#include<math.h>
using namespace std; 
char s[100];
int main()
{
  // ifstream cin("text.in");
  // ofstream cout("text.out");
    int cuv=0,lit=0,lungime=0;
    cin.getline(s,100);
lungime=strlen(s);
s[lungime]='.';
for(int i=0;i<=lungime;i++)
if(s[i]>='a'&&s[i]<='z')
{
       lit++;
       if(s[i+1]<'a'||s[i+1]>'z')         
       cuv++;        
                        
                        }
                        

//cout<<"litere="<<lit<<endl<<"cuvinte="<<cuv<<endl;
cout<<floor(lit/cuv);
 
return 0;

}