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  1. num = 9837421345
  2. prev = cur = 0
  3. while num:
  4. num, cur = divmod(num, 10)
  5. if cur < prev:
  6. print ('NO')
  7. break
  8. prev = cur
  9. else:
  10. print ('YES')
Success #stdin #stdout 0.03s 9296KB
stdin
Standard input is empty
stdout
NO