Solved by kledge

#	Title	# Solved	Avg. Tries
27433	팩토리얼 2	16,784	2.09
27866	문자와 문자열 STANDARD	59,928	1.48
28278	스택 2	13,925	2.70
31403	$A + B - C$	11,527	1.59

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