private static void recordChanges(String str) {
		int changes = 0;
		char []ch = str.toCharArray();
		int i=0,j=ch.length-1;
		
		
		while(i<j){
			if(!(ch[i]==ch[j])){
				//System.out.println(ch[i] + "->"+  ch[j]);
				changes+= Math.abs(ch[i] - ch[j]);
			}
			i++;
			j--;
			
		}
		
		System.out.println(changes);
		
	}