Solved by cheongsan16

#	Title	# Solved	Avg. Tries
13410	거꾸로 구구단	2,625	1.61
10869	사칙연산 STANDARD	214,381	2.22
10757	큰 수 A+B STANDARD	42,094	2.00
2557	Hello World STANDARD	337,397	2.54

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