input: Write a function to find the smallest number in a given list. The function should return the smallest number in the list.
  assert smallestNumber([4, 5, 6, 7, 8]) == 4
  assert smallestNumber([3, 2, 5, 1, 4]) == 1
  assert smallestNumber([9, 8, 7, 6, 5]) == 5
  assert smallestNumber([1, 1, 1, 1, 1]) == 1
  assert smallestNumber([7]) == 7
output: def smallestNumber(lst):
      return min(lst)