Solved by terryreds

#	Title	# Solved	Avg. Tries
27866	문자와 문자열 STANDARD	60,846	1.48
28278	스택 2	14,223	2.70
28279	덱 2	8,290	1.99
30802	Welcome Kit	10,428	1.87
31403	$A + B - C$	12,059	1.58

12456