#include <iostream>
#include <fstream>
#include <string.h>
#include <stdio.h>
using namespace std;

int main(){
    ifstream in("text.in");
    ofstream out("text.out");
    string when;
    int db = 1;
    int ossz = 0;
    getline(in,when);
    for(int i = 0;i<when.length();i++){
        if((when[i] == '-' or when[i] == ' ' or when[i] == '.' or when[i] == '!' or when[i] == '?' ) and when[i+2] != ' '){
            db++;
        }
        if(when[i] == '!' or when[i] == '.' or when[i] == '.' or when[i] == ':' or when[i] == '?' or when[i] == '/'){
            ossz--;
        }

    }
    ossz += when.length()-db;
    out << ossz/db;

    return 0;



}