Solved by chtoqur

#	Title	# Solved	Avg. Tries
27433	팩토리얼 2	12,762	2.08
27866	문자와 문자열 STANDARD	46,946	1.47
31403	$A + B - C$	3,848	1.52
31450	Everyone is a winner	1,020	1.27

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