gistfile1.java

import java.io.*;
import java.util.Scanner;

public class Main {
	// Start of main
	public static void main(String[] args) {
		PrintStream jout = new PrintStream(System.out);
		Scanner jin = new Scanner(System.in);
		jout.printf("Input a number: ");
		// input a number
		String a = jin.nextLine();
		int len = a.length();
		// build a char array
		char[] b = new char[len * 2 - 1];
		b[0] = a.charAt(0);
		for (int i = 1; i < len; i ++)
		{
			b[i * 2 - 1] = ' ';
			b[i * 2] = a.charAt(i);
		}
		String c = String.copyValueOf(b) + "\r\n";
		jout.printf(c);
	}// End of main
}