Solved by ldg917

#	Title	# Solved	Avg. Tries
15654	N과 M (5) STANDARD	27,175	1.38
15663	N과 M (9) STANDARD	19,828	2.03
15666	N과 M (12) STANDARD	16,708	1.26
16953	A → B	21,761	2.51
25083	새싹 STANDARD	75,783	1.88
25304	영수증	81,867	1.80
27866	문자와 문자열 STANDARD	60,964	1.48
30802	Welcome Kit	10,503	1.87
31403	$A + B - C$	12,119	1.58

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