# Given a list of integers, 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).

def odd_or_even(arr):
    x = sum(arr)
    if x%2==0:
        return "even"
    else:
        return "odd"

# or

def odd_or_even(arr):
    sum(arr)
    if sum(arr)%2 == 0:
        return "even"
    else:
        return "odd"

        