list1 = [48, 39, 23, 15, 11, 12, 5, 9, 7, 3, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0]

def pop_zeros(items):
    while items[-1] == 0:
        items.pop()

pop_zeros(list1)
pop_zeros(list2)
print(list1)

# Output:
[48, 39, 23, 15, 11, 12, 5, 9, 7, 3, 0, 0, 1, 0, 1]