6539: ABC166 —— A - A?C
[Creator : ]
Description
AtCoder Inc. holds a contest every Saturday.
There are two types of contests called $ABC$ and $ARC$, and just one of them is held at a time.
The company holds these two types of contests alternately: an $ARC$ follows an $ABC$ and vice versa.
Given a string $S$ representing the type of the contest held last week, print the string representing the type of the contest held this week.
There are two types of contests called $ABC$ and $ARC$, and just one of them is held at a time.
The company holds these two types of contests alternately: an $ARC$ follows an $ABC$ and vice versa.
Given a string $S$ representing the type of the contest held last week, print the string representing the type of the contest held this week.
Input
Input is given from Standard Input in the following format:
$S$
$S$
Output
Print the string representing the type of the contest held this week.
Constraints
S is ABC or ARC.
Sample 1 Input
ABC
Sample 1 Output
ARC
They held an ABC last week, so they will hold an ARC this week.