#include <iostream>
#include <fstream>
using namespace std;
int suma,nrc;
char d[100][100];
char s[1000];
char *p;
ifstream fin("text.in");
ofstream fout("text.out");
void citire ()
{
    fin.getline(s,1000);
}

void punere ()
{
    p=strtok(s,".,!? ");
    while(p)
    {
        strcpy(d[nrc++],p);
        p=strtok(NULL,".,!? ");
    }
}

int  parc ()
{
    for (int i=0;i<nrc;i++)
        suma+=strlen(d[i]);
    return suma;
}

int main()
{
    int ma;
    citire ();
    punere ();
    ma=parc()/nrc;
    fout<<ma;
    return 0;
}