e-olymp
Problems

A xor B

A xor B

Two positive integers a and b are given. Apply the bitwise exclusive or operation to them.

Input

Two positive integers a and b (a, b109).

Output

Print the result of applying xor operation over the given numbers.

Time limit 1 seconds
Memory limit 128 MiB
Input example #1
3 7
Output example #1
4
Input example #2
12 11
Output example #2
7
Author Oleg Petrov
Source 2013 Summer School Sevastopol, Wave 1, Day 3