implement a complete program that uses a cascading if$-$else statement In C$++.$ The goal is to output a letter grade based on the an integer score, to be input by the user.

Any score that's negative gets the message "Invalid Score".

Otherwise, if score is less than $50$ the grade is $"$F$"$

Otherwise, if the score is less than $70$ the grade is $"$D$".$

Otherwise, if the score is less than $80$ the grade is $"$C$".$

Otherwise, if the score is less than $90$ the grade is $"$B$".$

Otherwise $($in all other cases$)$ the grade is $"$A$".$

Notice the logic above doesn't use any logical operators. Each condition should just be a single inequality.

Below are sample outputs from six separate runs of the program to illustrate. Your output should be identical given the same input. Do not use a loop