```
+-+-+-+-+
|*|N|*|*|
+-+-+-+-+
|*| | |*|
+-+-+-+-+
|*| |N| |
+-+-+-+-+
|n| |n| |
+-+-+-+-+
```
The ASCII art above is a 4*4 chess board. The +, -, and | represent the borders of the chess board. The * indicates a space where pieces cannot move, capitalized N for white knight and lowercase n for black knight. 
Swap the positions of the white and black knights. However, pieces of the same color can move consecutively. Visualize each move of the piece with ASCII art.


그냥 o1은 계속 찐빠내는듯

나이트 흑백 위치 바꾸는 퍼즐임


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아래처럼 그래프로 만들어서 풀면 간단히 풀 수 있음


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