#include <bits/stdc++.h>

using namespace std;

char x;

int lungime,cardinal,w;

int main()
{
    ifstream in ("text.in");
    ofstream out ("text.out");

    while( in.get(x) )
    {
        if( (x>='A' && x<='Z') || (x>='a' && x<='z') )
        {
            if( w==0 )
            {
                w=1;
                cardinal++;
                lungime++;
            }
            else
                lungime++;
        }
        else
            w=0;
    }

    out<<lungime/cardinal;

    in.close();
    out.close();
    return 0;
}