count = 0 count1 = 0 count2 = 0

for i in preorder:
    for j in postorder:
        if i == j:
            count = count + 1

for i in postorder:
    for j in inorder:
        if i == j:
            count1 = count1 + 1

for i in preorder:
    for j in inorder:
        if i == j:
            count2 = count2 + 1
if count == length and count1 == length and count2 == length:
    return 1
else:
    return 0