Create an application that allows a teacher to enter three test scores each of the three students. The application should calculate each student’s average score and assign a letter grade based on the following grading scale:

Average Test Score Letter Grade
90 or greater A
80 through 89 B
70 through 79 C
60 through 69 D
Below 60 F

The application should prompt the user for each students name and three test scores. A box needs to appear after all the data has been entered showing the results. Only allow numeric values for the grades. Allow alphabet for the names only.

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