Envío 1037

Código

nNumbers = int(input())
numbers = list(map(int, input().rsplit(" ")))
assert nNumbers == len(numbers), "Different lengths."
control = 0
left = 0
right = 0
idx = nNumbers - 1
for number in numbers[::-1]:
    control += number
    if control < 0:
        right += number
        index = idx
    else:
        left += number
    idx -= 1
if left < 1:
    index = "Impossible"
print(index)