Ciel and AB Problem

All submissions for this problem are available.
In Ciel's restaurant, a waiter is training.
Since the waiter isn't good at arithmetic, sometimes he gives guests wrong change.
Ciel gives him a simple problem.
What is AB (A minus B) ?
Surprisingly, his answer is wrong.
To be more precise, his answer has exactly one wrong digit.
Can you imagine this?
Can you make the same mistake in this problem?
Input
An input contains 2 integers A and B.
Output
Print a wrong answer of AB.
Your answer must be a positive integer containing the same number of digits as the correct answer, and exactly one digit must differ from the correct answer.
Leading zeros are not allowed.
If there are multiple answers satisfying the above conditions, anyone will do.
Constraints
1 ≤ B < A ≤ 10000
Sample Input
5858 1234
Sample Output
1624
Output details
The correct answer of 58581234 is 4624.
So, for instance, 2624, 4324, 4623, 4604 and 4629 will be accepted, but 0624, 624, 5858, 4624 and 04624 will be rejected.
Notes
The problem setter is also not good at arithmetic.
Author:  laycurse 
Tester:  shangjingbo 
Editorial  http://discuss.codechef.com/problems/CIELAB 
Tags  cook17, easy, laycurse 
Date Added:  22112011 
Time Limit:  0.949579 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.5, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, CLOJ, FS 
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