10.3.2. Character

Letter	A ~ Z, a ~ z, Korean letters (Except notes and strings, every letter should be uppercase.)
Digit	0 ~ 9
Symbol	! " ' # $ % & ( ) * + - . , / * : ; = < > ? @ ` [ * ] ^ { } ｜ _
Space	<space>, <tab>(Before being transferred to the controller, <tab> is converted to <space>.)