Matrix Commands

You are given a 2-D matrix and a list of string commands. Each command must be applied in order to the current state of the matrix. The commands are:

• "print" — output the matrix row-by-row as space-separated integers, with each row on a new line.
• "rotate 90" — rotate the matrix 90 degrees clockwise in place. After rotation an n × m matrix becomes m × n.
• "swap r1 c1 r2 c2" — swap the values of the cells at (r1, c1) and (r2, c2); indices are 0-based.
• "set r c val" — assign the integer val to the cell at (r, c); indices are 0-based.

Implement a function that takes the initial matrix and the list of commands and returns the list of strings produced by every "print" command in the order they appear.