#include <iostream>
#include <cstring>
#include <fstream>

using namespace std;

int get_average_length(char text[])
{
    int words = 0, wordschars = 0;
    for (int i = 0; i < strlen(text); i++)
    {
        if ((text[i] >= 'a' && text[i] <= 'z') || (text[i] >= 'A' && text[i] <= 'Z'))
        {
            wordschars++;
        }
        else if (text[i] == '-' || text[i] == ' ')
        {
            words++;
        }
    }
    words++;
    return wordschars / words;
}

int main()
{
    ifstream read("text.in");
    char text[300];
    read.getline(text, 300);
    read.close();
    ofstream write("text.out");
    write << get_average_length(text);
    write.close();
    return 0;
}