Deleting First Line From A Text File

I am want to delete the first line of text file using RandomAccessFile class. My Input file "bulkwfids.txt" has the data as below:

234567
345578
455678
566667

Expected output needs to be(first line deleted):

345578
455678
566667

But the actual ouput I am getting is as follows:

78
56
345578
455678
566667

Here is the code snippet I have written:

import java.io.*;
class DeleteLine {
public static void main(String [] args) throws FileNotFoundException, IOException {
  RandomAccessFile raf = new RandomAccessFile("C://Users/hp/Desktop/bulkwfids.txt", "rw");
raf.readLine();
 
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