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EILTGRADE - Letter grades

Given the overall score of a student, please calculate the corresponding letter grade using following rules:

Overall score

Letter grade

90 – 100

A

85 – 89

A-

80 – 84

B+

75 – 79

B

70 – 74

B-

65 – 69

C+

60 – 64

C

55 – 59

C-

53 – 54

D+

52

D

50 – 51

D-

0 – 49

F

Input

An only integer p which is the overall score (0 ≤ p ≤ 100).

Output

The corresponding letter grade.

Sample

Input

Output

40

F

73

B-


Added by:Ha Minh Ngoc
Date:2019-11-03
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: GOSU
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