human
I found an interesting problem on https://codeforces.com/problemset/problem/995/A:
Allen dreams of one day owning a enormous fleet of electric cars, the car of the future! He knows that this will give him a big status boost. As Allen is planning out all of the different types of cars he will own and how he will arrange them, he realizes that he has a problem. 

Allen's future parking lot can be represented as a rectangle with $4$ rows and $n$ ($n \le 50$) columns of rectangular spaces, each of which can contain at most one car at any time. He imagines having $k$ ($k \le 2n$) cars in the grid, and all the cars are initially in the second and third rows. Each of the cars also has a different designated parking space in the first or fourth row. Allen has to put the cars into corresponding parking places.

 [Image] Illustration to the first example. 

However, since Allen would never entrust his cars to anyone else, only one car can be moved at a time. He can drive a car from a space in any of the four cardinal directions to a neighboring empty space. Furthermore, Allen can only move one of his cars into a space on the first or fourth rows if it is the car's designated parking space. 

Allen knows he will be a very busy man, and will only have time to move cars at most $20000$ times before he realizes that moving cars is not worth his time. Help Allen determine if he should bother parking his cars or leave it to someone less important.

-----Input-----

The first line of the input contains two space-separated integers $n$ and $k$ ($1 \le n \le 50$, $1 \le k \le 2n$), representing the number of columns and the number of cars, respectively.

The next four lines will contain $n$ integers each between $0$ and $k$ inclusive, representing the initial state of the parking lot. The rows are numbered $1$ to $4$ from top to bottom and the columns are numbered $1$ to $n$ from left to right.

In the first and last line, an integer $1 \le x \le k$ represents a parking spot assigned to car $x$ (you can only move this car to this place), while the integer $0$ represents a empty space (you can't move any car...

I tried it in Python, but could not do it. Can you solve it?

What is a Python program to determine if he should bother parking his cars or leave it to someone less important?
assistant
#Here is Python program to determine if he should bother parking his cars or leave it to someone less important.

def main():
    n, k = map(int, input().split())
    a, b, c, d = (list(map(int, input().split())) for _ in 'abcd')
    ss, tt, n2, res = [*b, *c[::-1]], [*a, *d[::-1]], n * 2, []
    yx = [*[(2, i + 1) for i in range(n)], *[(3, i) for i in range(n, 0, -1)]]

    def park():
        for i, s, t, (y, x) in zip(range(n2), ss, tt, yx):
            if s == t != 0:
                ss[i] = 0
                res.append(f'{s} {(1, 4)[y == 3]} {x}')

    def rotate():
        start = ss.index(0)
        for i in range(start - n2, start - 1):
            s = ss[i] = ss[i + 1]
            if s:
                y, x = yx[i]
                res.append(f'{s} {y} {x}')
        ss[start - 1] = 0

    park()
    if all(ss):
        print(-1)
        return
    while any(ss):
        rotate()
        park()
    print(len(res), '\n'.join(res), sep='\n')

def __starting_point():
    main()

__starting_point()