def replace_after_odd(arr):
odd_found = False
for i in range(len(arr)):
if odd_found:
arr[i] = 0
if arr[i] % 2 != 0:
odd_found = True
return arr
A = [1, 3, 4, 5, 6]
result = replace_after_odd(A)
print(result)

Результат выполнения кода:

[1, 0, 4, 5, 0]