2494: A - A?C

Memory Limit：128 MB Time Limit：1.000 S
Judge Style：Text Compare Creator：
Submit：16 Solved：10

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.

Constraints

  • S is ABC or ARC.

Input

Input is given from Standard Input in the following format: 

S

Output

Print the string representing the type of the contest held this week.

Sample Input Copy 

ABC

Sample Output Copy 

ARC

Source/Category

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