Given a 2D array of strings, which represents a letter matrix. Your task is to rotate this matrix 90 degrees clockwise and output the result.
If the matrix is 
2 J C 3
E 9 Y A
W E A V.
What is the result?
Return your answer with format <<<list of values and symbols>>>, For example, <<<A,B,C,D>>> represents a 2D array.