import java.io.*;

public class ByteArrayOutputStreamDemo
{
	public static void main(String[] args)
	{
		String s = "abcdefghijklmnopqrstuvwxyz";
		
		ByteArrayOutputStream bas = new ByteArrayOutputStream();
		bas.writeBytes(s.getBytes()); 
		  
		byte[] b = bas.toByteArray();
		for(int c: b)
			System.out.print((char)c);
		System.out.println();
	}
}