is there any way to receive keyboard inputs like a simple program where user types anything to the program and program will display it.

Yeah - check out the Devkit mouse and keyboard mode part of the stat page on the wiki.
http://pico-8.wikia.com/wiki/Stat

Edit: on a quick look just searching 'mouse' on the bbs there's plenty of threads and carts for reference and ideas on how to use the tools.
Couple examples:
a library for keyboard and mouse
https://www.lexaloffle.com/bbs/?tid=31079

Mouse collision with the world:
https://www.lexaloffle.com/bbs/?tid=31110

... there's piles of stuff. Just search mouse:
https://www.lexaloffle.com/bbs/?cat=7#search=mouse

(or keyboard)

@Davbo Thanks