To-Do List Manager

You are required to implement a simple to-do list manager that processes a series of commands. The commands are given as input from stdin and the outputs must be printed to stdout.

The supported commands are:

• ADD <task>: Adds the text task to the end of the to-do list.
• REMOVE <index>: Removes the task at the given 1-based index if it exists.
• LIST: Prints all current tasks, each on a new line. If the list is empty, print No tasks.

In mathematical terms, let \(L\) be the list of tasks. An ADD operation appends an element \(x\) (i.e. \(L = L \cup \{x\}\)), and a REMOVE operation removes the \(i\)th element if \(1 \le i \le |L|\). A LIST command outputs the tasks if \(|L| > 0\), otherwise it outputs "No tasks".

inputFormat

The first line contains an integer n representing the number of commands.

The next n lines each contain a command. Commands can be one of the following forms:

• ADD <task>
• REMOVE <index>
• LIST

Each command will be processed in the order they are provided.

outputFormat

For each LIST command encountered in the input, output the current to-do list:

• If the to-do list is not empty, output each task on a new line in the order they were added.
• If the to-do list is empty, output No tasks.

The outputs should appear in the same order as the LIST commands are processed.

## sample

3
ADD Buy groceries
ADD Call John
LIST

Buy groceries
Call John

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