[Question Description] Write a program that prompts the user to enter a letter grade A/a,B/b,C/c,D/d, or F/f and displays its corresponding numeric value 4,3,2,1, or 0. If the user enter other letters the p rogam should output 'N'. [Input Format] a letter [Output Format] an integer [Input Example] B [Output Example] 3 [Example Instruction] [Evaluation Standards]

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