1. Set unsorted list = [5, 3, 9, 1]
2. Iterate through unsorted list
 3. Compare unsorted[i] to unsorted[i+1]
 4. If unsorted[i] > unsorted[i+1], swap them
 5. Repeat step 3 to 4 until end of list
 6. Observe the list is now sorted.
Sviluppa un algoritmo per ordinare i seguenti numeri: 5, 3, 9, 1.