Question: In python write the following program: Letter Grade to Number and do Input Validation. The input should be exactly one or two character in length

In python write the following program:

Letter Grade to Number and do Input Validation.

The input should be exactly one or two character in length With an uppercase character potentially followed by either + or -

You should not accept "nonsense" grades such as "G+" If the user enters any type of invalid input simply print ERROR Otherwise return the correct corresponding grade value

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