Problem
Read a list of students with names and grades. Sort them by grade descending.
Input (from file `input.txt`):
- First line: integer N (1 ≤ N ≤ 100)
- Next N lines: each line has name (max 20 characters) and grade (integer)
Output (to file `output.txt`):
- N lines with student names in descending order of grades
Example
input.txt:
3
Alice 90
Bob 95
Charlie 85
output.txt:
Bob
Alice
Charlie
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