private String calc(String input) {
	  //Person 2 put your implementation here
		Random r = new Random();
		char[] str = input.toCharArray();
		char temp;
		int rIndex;
		for(int i = 0; i < input.length(); i++){
			temp = str[i];
			rIndex = r.nextInt(input.length());
			str[i] = str[rIndex];
			str[rIndex] = temp;
			
		}
		String resString = "";
		for(char c: str){
			resString = resString + c;
		}
		return resString; //TODO
	}