You are given a 5x5 matrix of integers as tuple of tuples. Use it as a mask for the square-arranged letters of the alphabet from "a" to "y" (row-major order). Return a string of characters (sorted, ignore case), picked from the square of letters according to the mask with the following rule:

• 0 in mask - do not take the respective character;
• 1 - take in lowercase;
• 2 - take in uppercase.

Here is a mission to make a reverse conversion - String-2-Matrix.

Input: Tuple of five tuples of five integers (int) each.

Output: String (str).

Examples:

assert (
    converter(
        (
            (0, 0, 1, 0, 0),
            (0, 1, 0, 1, 0),
            (1, 0, 2, 0, 1),
            (0, 1, 0, 1, 0),
            (0, 0, 1, 0, 0),
        )
    )
    == "cgikMoqsw"
)
assert (
    converter(
        (
            (1, 0, 1, 0, 1),
            (0, 2, 0, 2, 0),
            (1, 0, 1, 0, 1),
            (0, 2, 0, 2, 0),
            (1, 0, 1, 0, 1),
        )
    )
    == "aceGIkmoQSuwy"
)