{"problem":{"name":"A?C","description":{"content":"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 A","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc166_a"},"statements":[{"statement_type":"Markdown","content":"AtCoder Inc. holds a contest every Saturday.\nThere are two types of contests called ABC and ARC, and just one of them is held at a time.\nThe company holds these two types of contests alternately: an ARC follows an ABC and vice versa.\nGiven a string $S$ representing the type of the contest held last week, print the string representing the type of the contest held this week.\n\n## Constraints\n\n*   $S$ is `ABC` or `ARC`.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$S$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc166_a","tags":[],"sample_group":[["ABC","ARC\n\nThey held an ABC last week, so they will hold an ARC this week."]],"created_at":"2026-03-03 11:01:14"}}