Rotating a string 180 degrees

Reverse.java

public static String Reverse(String sentence){
		
		String normal = "abcdefghijklmnopqrstuvwxyz_,;.?!/\\'";
		String split  = "ɐqɔpǝɟbɥıظʞןɯuodbɹsʇnʌʍxʎz‾'؛˙¿¡/\\,";
		
		normal += "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		split  += "∀qϽᗡƎℲƃHIſʞ˥WNOԀὉᴚS⊥∩ΛMXʎZ";
		
		normal += "0123456789";
		split  += "0ƖᄅƐㄣϛ9ㄥ86";
		
		
		StringBuilder res = new StringBuilder();
		
		for(int i = sentence.length()-1; i>= 0; i--){
			char letter = sentence.charAt(i);
			int a = normal.indexOf(letter);
			res.append((a != -1) ? split.charAt(a) : letter);
		}
		
		return res.toString();
	}