Question $1$

Create a table of contents for a simple markup language. It must follow two rules:

If a line starts with a single $||$ followed by a space, then it's a chapter title.

If a line starts with a double if followed by a space, then it's a section title.

The table of contents should be displayed in the following format:

Title of the first chapter

$1\mathrm{.}1.$ Title of the first section of the first chapter

$1\mathrm{.}2.$ Title of the second section of the first chapter

$...$

Title of the second chapter

$2\mathrm{.}1.$ Title of the first section of the second chapter

$2\mathrm{.}2.$ Title of the second section of the second chapter

$...$

Note that each number is followed by a period and the last period is followed by $1$ space.

For example, the input text is $n=1$ llines