import java.io.*;
import hsa.Console;
import java.util.StringTokenizer;

// The "UnicornsTeasoons" class.
public class Wordcount
{
    public static void main (String[] args) throws IOException
    {

	// Open up the input and output file for IO purpose
	FileReader inFile = new FileReader ("DATA2.txt");
	FileWriter outFile = new FileWriter ("OUT2.txt");

	// Link the input and output file for
	BufferedReader in = new BufferedReader (inFile);
	BufferedWriter out = new BufferedWriter (outFile);

	String line;

	// Keep reading as long as not end of file (eof)
	while ((line = in.readLine ()) != null)
	{
	    int num = 0;
	    StringTokenizer words = new StringTokenizer (line);
	    while (words.hasMoreTokens ())
	    {
		String token = words.nextToken ();
		int len = token.length ();
		int letterlength = 0;
		for (int count = 0 ; count < len ; count++)
		{
		    char letter = token.charAt (count);
		    if ((letter >= 'a' && letter <= 'z') || (letter >= 'A' && letter <= 'Z'))
		    {
			letterlength++;
		    }
		    if (letter == '\'')
		    {
			letterlength = letterlength - 1;
		    }

		}
		if (letterlength >= 4)
		{
		    num++;
		}
	    }
	    String numStr = num + "";
	    out.write (numStr);
	    out.newLine ();
	    out.flush ();
	}
	out.close ();



    } // main method
} // End of Class