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Problems

A xor B

A xor B

Time limit 1 second
Memory limit 128 MiB

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

Input data

Two positive integers a and b (a, b10^9).

Output data

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

Examples

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