import java.io.*;

public class RemoveAha {

    public static void main (String [] args) throws IOException {
	// Setting up the reading:
	// Create a buffered reader
	BufferedReader in = new BufferedReader(
			new InputStreamReader(System.in));
	// to read a line of input, use in.readLine();

	// prompt the user:
	String input = in.readLine();
	String result = input.replaceAll("aha","");
	System.out.println("Aha! You meant");
	System.out.println(result);
	System.out.println("When you said");
	System.out.println(input);
    }

}


This is an example from CSci 1211 course.