Getting Number Format exception on test cases

I unblocked a test case and getting the error:

Exception in thread β€œmain” java.lang.NumberFormatException: For input string: β€œ3044226792”
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:583)
at java.lang.Integer.valueOf(Integer.java:766)
at Main.compare(Main.java:52)
at Main.sort(Main.java:39)
at Main.main(Main.java:19)

Please explain why i it so