│ Given a list of numbers with only 3 unique numbers (1, 2, 3), │sort the │ list in O(n) time. │ Example 1: │Input: [3, 3, 2, 1, 3, 2, 1] │Output: [1, 1, 2, 2, 3, 3, 3] │ │def sortNums(nums): │ # Fill this in. │print sortNums([3, 3, 2, 1, 3, 2, 1]) │# [1, 1, 2, 2, 3, 3, 3] │ │ Challenge: Try sorting the list using constant space.