Solved by takecho

#	Title	# Solved	Avg. Tries
2557	Hello World STANDARD	338,423	2.54
2558	A+B - 2 STANDARD	72,579	1.38
9498	시험 성적 STANDARD	194,271	1.82
27866	문자와 문자열 STANDARD	48,214	1.47
31403	$A + B - C$	4,644	1.53

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