-ATabc255a [ABC255A] You should output ARC, though this is ABC. 入门 -ATabc254a [ABC254A] Last Two Digits 入门 -ATabc254b [ABC254B] Practical Computing 入门 -ATabc253a [ABC253A] Median? 入门 -ATabc253b [ABC253B] Distance Between Tokens 入门 -ATabc252a [ABC252A] ASCII code 入门 -ATabc252b [ABC252B] Takahashi's Failure 入门 -ATabc251a [ABC251A] Six Characters 入门 -ATabc251b [ABC251B] At Most 3 (Judge ver.) 入门 -ATabc251c [ABC251C] Poem Online Judge 入门 -ATabc250a [ABC250A] Adjacent Squares 入门 -ATabc250b [ABC250B] Enlarged Checker Board 入门