In this task, you are given a list of unique integers you need to swap the positions of maximum and minimum element in the list and return the updated list.
Q: [74, 53, 246, 327, 356, 92, 456, 452, 29, 209, 396, 463, 210, 324, 225, 89, 286, 122, 437, 118]
A: 
[74, 53, 246, 327, 356, 92, 456, 452, 463, 209, 396, 29, 210, 324, 225, 89, 286, 122, 437, 118]