#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int countWords(string content)
{
    int words = 0, i = 0;
    while (isspace(content[i++]))
        ;
    for (; i < content.size(); i++)
    {
        if (content[i] == ' ' || content[i] == '\0')
        {
            while (content[i] == ' ')
                i++;
            words++;
        }
    }
    return words + 1;
}

int trim(string s)
{
    int a = 0;
    for (int i = 0; i < s.size(); i++)
    {
        if ((s[i] >= 'a' && s[i] <= 'z') || (s[i] >= 'A' && s[i] <= 'Z'))
            a++;
    }
    return a;
}

int main()
{
    ifstream f("text.in");
    ofstream g("text.out");

    string line;
    string content;

    while (getline(f, line) != NULL)
        content.append(line);

    g<<trim(content) / countWords(content);// / countWords(content);// / countWords(content);
    //cout<<s;
    return 0;
}