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  1. i = 0
  2. times = []
  3. n = int(input())
  4. while i < n:
  5. start, end = input().split()
  6. times.append((start, 'start'))
  7. times.append((end, 'zend'))
  8. i += 1
  9.  
  10. times = sorted(times)
  11. print(times)
Success #stdin #stdout 0.02s 9344KB
stdin
2
2 10
5 6
stdout
[('10', 'zend'), ('2', 'start'), ('5', 'start'), ('6', 'zend')]