Matrix operation maximum value - digit, +, -, right or down, can't change direction

Given a matrix containing digits and operators (+ and -), you can start from the top-left corner, and only move right or down, without changing direction, find the maximum value path from top-left to bottom-right. Example Matrix: [["3", "+", "2", "-", "2"], ["5", "-", "", "+", "4"], ["3", "+", "2", "-", "1"]] Allowed one path: 3 -> + -> 2 -> - -> 2 -> + -> 4. Output Maximum value: 5 Example Input [["3", "+", "2", "-", "2"], ["5", "-", "0", "+", "4"], ["3", "+", "2", "-", "1"], ["3", "-", "2", "-", "2"]] Output 5