Description
Write a program that outputs the appropriate grade when KTY's score is X.
The grades for each score are as follows.
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A++ if X is 100
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97~99 is A+
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A for 93-96
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90-92 is A-
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87-89 is B+
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B if 83-86
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80-82 is B-
...
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D+ if 67~69
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D if 63-66
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60-62 is D-
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F if X < 60
Input
An integer X between 0 and 100 is input.
Output
Print out KTY's grade.