|You want to type a document containing only spaces and new lines.
Let SP and NL denote a space character and a new line character, respectively.
You are given a int lines describing the desired document.
The elements of lines represent the number of SP characters in each line,
Each line must end with a NL character.
In other words, the document should look like this:
lines SP characters, followed by a NL,
followed by lines SP characters, followed by a NL,
..., lines[N-1] SP characters, followed by a NL
(where N is the number of elements in lines).
The editor has a cursor, which can be positioned between two adjacent characters or at the beginning or end of the document. You can move this cursor freely.
The editor has three special keys:
|-||lines will contain between 1 and 50 elements, inclusive.|
|-||Each element of lines will be between 0 and 1,000,000, inclusive.|