번호	제목
19181	Message
19182	Arithmetic Sequences
19183	Subsequence
19184	Algebra is Awesome
19185	Bus Lines
19186	Coal Mine
19187	Chocolate is Tasty
19188	Game
19189	Tic-tac-toe
19190	Bermutation
19191	Grid
19192	Heap
19193	Lines
19194	Yet Another Problem About Permutations
19195	Strange Sequence
19196	Shortest Accepted Word
19197	Work
19198	Ambitious Plan
19199	Borderless Words
19200	Catalan Combinatorial Objects