Задание 4.3

a = [2,4,6,8,9,3,4,3,3,6,7]
n = len(a)

for i in range(n-1):
    max_a = 0
    for j in range(1, n-i):
        if a[j] > a[max_a]:
            max_a = j
    a[max_a], a[j] = a[j], a[max_a]
print(a)