#include <bits/stdc++.h>
#define pb push_back
using namespace std ;
ifstream in ("text.in") ;
ofstream out ("text.out") ;

int newword , nralpha , nrword ;

int main ()
{
    char c ;
    while ( in.get( c ) )
    {
        if ( isalpha( c ) )
        {
            nralpha ++ ;
            if ( newword == 0 )
                newword = 1 , nrword ++ ;
        }
        else    newword = 0 ;
    }
    out << nralpha / nrword ;
    return 0 ;
}