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function opposite(c) {
	var result='';
	var ch='';
	var list1='0123456789ABCDEF';
	var list2='FEDCBA9876543210';
	
	for (var i=0; i<c.length; i++) { 
		ch=c.charAt(i);
		for (var n=0; n<list1.length; n++) { 
			if(ch==list1.charAt(n)) result += list2.charAt(n);
		}
	}
	
	return result;
}