Write a program that starts with an empty line of text, and accepts the following

commands:

$$ L: moves cursor to the left;

$$ R: moves cursor to the right;

$$ I s: inserts the string s at the current position;

$$ D: deletes the character at the current position;

$$ C c: changes the character at the current position to the character c;

$$ U: changes all characters to the upper case equivalent $($use apply$)$;

$$ l: changes all characters to the lower case equivalent $($use apply$)$;

$$ P: prints the current content of the line and the cursor position;

$$ Q: quits the program.

For simplicity, you may assume that the character c and the string s in the

commands above do not have whitespace characters. Use the underscore $(\_)$

instead if you wish to use a space. Write your program in prob$1.$cc$.$