• 21



Make several moves on a chessboard and print the final position as an FEN string.

8 r n b q k b n r
7 p p p p p p p p
6 . . . . . . . .
5 . . . . . . . .
4 . . . . . . . .
3 . . . . . . . .
2 P P P P P P P P
1 R N B Q K B N R
a b c d e f g h

The above position is represented in FEN by the string:


FEN describes a Chess Position with a one-line ASCII string.
The piece placement is determined rank-by-rank, starting at rank 8 and proceeding down to rank 1.
Each rank string is separated by the terminal symbol '/' (slash).
Each rank string scans piece placement from column a to column h.
A decimal digit counts consecutive empty spaces.
The pieces are identified by a single letter. (k=king, q=queen, r=rook, b=bishop, n=knight, p=pawn)
Uppercase letters are for white pieces, lowercase letters for black pieces.

The moves you have to make are defined by a string with either 4 or 5 chars, where:
- The first two chars represent the starting square,
- The next two chars represent the target square and
- The last (optional) char represents the piece you get if / when a pawn promotion occurs.

Example: "e7e8Q" - you must remove the pawn on the e7 square and place a white queen on the e8 square.

Example: "e1g1" - you must remove the king on the e1 square and place it on the g1 square. But a king can't move more than 1 square unless he is castling, so you must also move the rook on the h1 square to the f1 square in order to complete the castling move.

Example: "h5g6" - you must remove the pawn on the h5 square and place on the g6 square. If there is not a piece on g6 but there is a pawn on g5 then you must remove the pawn on g5 in order to complete the "en passant" move.

All the moves are legal and can be made following standard chess rules.
Line 1: An FEN string B describing the initial board position.
Line 2: An integer N for the number of moves to make.
Next N lines: A string M for the coordinates (and optional promotion piece) of a move.
Line 1: An FEN string describing the final board position.
1 ≤ N ≤ 100
Solve it

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