Conditional formatting: Cell color based on text input

[its_me_renan]

Hello to all,

Would like to seek help in relation to cell conditional formatting with different conditions. What I would like to happen is at cell B2 I can input 1 letter (x, m,a, or n) which has a corresponding cell color at cell B4. If i input letter "X" on cell B2, Cell B4 will change to color Blue. If i input letter "M" on cell B2, Cell B4 will change to color yellow. If i input letter A or N the color of cell B4 will be green. Thank you.

 

[its_me_renan]

Pls don't reply I already know how to do it.
Thank you