#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

void citire(char s[100])
{
    f.get(s,100);
    f.close();
}
int solve(char s[100])
{
    char *p;
    int i=0,nr=0;
    p=strtok(s,"- ,!.?[]()");
    while(p)
    {
        i++;
        nr+=strlen(p);
        p=strtok(NULL,"- ,!.?[]()");
    }
    return nr/i;
}
int main()
{
    char s[100];
    citire(s);
    g<<solve(s);
    g.close();
    return 0;
}