Solved by takecho

#	Title	# Solved	Avg. Tries
2557	Hello World STANDARD	352,426	2.54
2558	A+B - 2 STANDARD	75,370	1.38
9498	시험 성적 STANDARD	203,309	1.83
27866	문자와 문자열 STANDARD	55,744	1.48
31403	$A + B - C$	9,331	1.58

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