#include <bits/stdc++.h>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int nr,nrcv;
char s[1001];

int main()
{
    f.getline(s,1001);
    char *p=strtok(s,"    ,.?!;-");
    while(p)
    {
        nr+=strlen(p);
        nrcv++;
        p=strtok(NULL,"    ,.?!;-");
    }
    g<<nr/nrcv;
    return 0;
}
//https://configurator.volkswagen.ro/cc-ro/ro_RO_VW/V/detail/200/CB249T20/2T2T/DN/PKK@PAH@WD4@KA6@6SJ@1M6@$DN@PXA@$VWVW5@KS2@PW9@7TT@3Y5@PA6@PW2@WSQ@PEM@PGW@PQU@WL7@PDS@$3G1G3@PH4@RCB@7K3@PPZ@9VC@PSW@8A9@PS4@2FT@YOS@PR9@/@?GrossNetSwitch=GROSS&specialTaxCalculationMethod=DPFN13