#include<iostream>
#include<cstring>
#include<fstream>

using namespace std ;

ifstream fin ("text.in");
ofstream fout ("text.out");

int main()
{
    char s[251] ;
    int cnt = 0 ;
    char sep[] = " ,-;";
    int cnnt = 0 ;
    fin.getline(s,251);
    char *p ;
    p = strtok(s , sep);
    while (p)
    {
        cnnt ++;
        for (int i = 0 ; i<=strlen(p)-1;i++)
        cnt ++ ;
        p = strtok (NULL ,sep);
    }
    double plm = cnt / cnnt;
    fout << (int) plm;
    return 0;
}