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50469 - Letter Grades

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Time limit 2000/4000/4000/4000 ms. Memory limit 65000/65000/65000/65000 Kb.
Question by Ibrahim Mesecan.

Letter Grades

The University converts grades into Letter grades. And, at the end of every semester, they keep report of each course. They count the number of students receiving each grade for every course.

Question: The grades are converted into letter grades using the conversion table on the right. Write a program that is going to read n student grades. And then, it will count the number of students receiving each grade.

Input specification
You will be given an integer number (n) at the beginning where 1 ≤ n ≤ 100. Then in the following line, you will be given n integers which are between 0 and 100.

Output specification
Show each letter grade followed by the number of students receiving that grade. Show the letter grades in increasing order starting from A.

 Sample Input   
  7
  62 29 85 71 64 94 67
 Sample Output   
  A 1
  B 1
  C 1
  D 3
  E 0
  F 1

Explanation: Here is the list of grades for each letter:
  A: 94
  B: 85
  C: 71
  D: 62, 64, 67
  E: No grade
  F: 29


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