our program will ask user to input a score between $0$ to $100$ inclusive.

It will output letter grade A$,$ B$,$ C$,$ D$,$ F on the screen accordingly.

$-$ write a short description for this homework

$-$ use keyboard input for score,

$-$ use if$-$elif$-$else to convert score $[0-100]$ to A$,$ B$,$ C$,$ D$,$ F

$-$ output should be A$,$ B$,...,$ F$.$