# Task:
Given a list of numbers, determine whether the sum of its elements is odd or even.
Give your answer as a string matching `"odd"` or `"even"`.
If the input array is empty consider it as: `[0]` (array with a zero).
## Example:
```
odd_or_even([0])          ==  "even"
odd_or_even([0, 1, 4])    ==  "odd"
odd_or_even([0, -1, -5])  ==  "even"
```
Have fun!
def odd_or_even(arr):
    if arr: return 'odd' if sum(arr) % 2 else 'even'
    else: return 'even'

def odd_or_even(arr):
    if arr: return 'odd' if sum(arr) % 2 else 'even'
    else: return 'even'
