Unique List Implementation

You are required to implement a class UniqueList that works similarly to a built-in list, but it only stores unique elements. That is, duplicate values are not allowed.

The UniqueList class should support the following operations:

• Initialization: When initialized with a list of integers, only the first occurrence of each element is kept (preserving the order).
• add x: Adds the integer x to the list if it is not already present.
• remove x: Removes the integer x from the list. If x is not present, output an error message exactly as: \(\text{ValueError: Item 'x' not found}\).
• get i: Retrieves the element at index i (0-indexed). It is guaranteed that i is a valid index.
• print: Outputs the entire list in a format identical to Python's list string representation. For example: [1, 2, 3].

You need to read input from standard input (stdin) and write output to standard output (stdout). The input format is described below.

Note: If a remove operation is attempted on a non-existent element, output the error message and continue processing subsequent operations.

Implementation Details:

• You must use the provided operations and follow the input/output requirements exactly.
• The error message when removal fails must be in LaTeX format when describing the rule, i.e., using \(\text{ValueError: Item 'x' not found}\) in the description. The actual output should match the string exactly.

inputFormat

The first line contains an integer n, the number of elements in the initial list.

The second line contains n space-separated integers representing the initial list. Duplicates may be present; only the first occurrence should be kept.

The third line contains an integer m, the number of operations to perform.

The following m lines each contain one of the following commands:

• add x — add integer x to the list (if not already present).
• remove x — remove integer x from the list. If x is not present, output the error message.
• get i — output the element at index i (0-indexed).
• print — output the current list.

outputFormat

For each get and print command, output the result on a separate line in the order they appear.

If a remove command is attempted with a non-existent element, output the following error message exactly:

ValueError: Item 'x' not found

There is no output for add commands or successful remove commands.

## sample

3
1 2 3
4
add 4
add 2
get 1
print

2
[1, 2, 3, 4]

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