#include <iostream>
#include <stdio.h>

using namespace std;

char text[100000], a;
long long nr, i, nr_cuv, nr_crt, rez;

int main()
{
    freopen("text.in","r",stdin);
    freopen("text.out","w",stdout);
    i = 1;
    while(scanf("%c", &a) != EOF)
    {
        text[i] = a;
        i++;
    }
        nr = i-2;
    for (i=2;i<=nr;i++)
    {
       if(text[i] == ' ' && (text[i-1] != '.' || text[i-1] != ',' || text[i-1] != '-' || text[i-1] !=  ';' || text[i-1] != '?' || text[i-1] != '!') )
        {
            nr_cuv++;
        }
        if (text[i] != ' ' && text[i] != '.' && text[i] != ',' && text[i] != '-' && text[i] !=  ';' && text[i] != '?' && text[i] != '!')
        {
            nr_crt++;
        }
    }
    nr_cuv++;
    if (text[1] != ' ' && text[1] != '.' && text[1] != ',' && text[1] != '-' && text[1] !=  ';' && text[1] != '?' && text[1] != '!')
        {
            nr_crt++;
        }
    rez = nr_crt / nr_cuv;
    printf("%lld ", rez);
}