list = [4, 1, 8, 2, 6]

min_array = []
max_array = []

for i in range(list[0], len(list)-1):
    if list[i] < list[i+1]:
        min_array.clear()
        min_array.append(i)
    else:
        min_array.clear()
        max_array.append(i)
print(min_array)
print(max_array)