Solved by takecho

#	Title	# Solved	Avg. Tries
2557	Hello World STANDARD	362,413	2.54
2558	A+B - 2 STANDARD	77,318	1.39
9498	시험 성적 STANDARD	209,865	1.82
27866	문자와 문자열 STANDARD	61,242	1.48
31403	$A + B - C$	12,296	1.59

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