68. 4-bit Comparator

How do you plan to solve it?

/*Write your code here*/
module maxmin4(
    input [3:0] a,
    input [3:0] b,
    input [3:0] c,
    input [3:0] d,
    output [3:0] max,
    output [3:0] min
);

wire [3:0] max_ab, max_cd;
wire [3:0] min_ab, min_cd;

assign max_ab = ($unsigned(a) > $unsigned(b)) ? a : b;
assign max_cd = ($unsigned(c) > $unsigned(d)) ? c : d;

assign min_ab = ($unsigned(a) < $unsigned(b)) ? a : b;
assign min_cd = ($unsigned(c) < $unsigned(d)) ? c : d;

assign max = ($unsigned(max_ab) > $unsigned(max_cd)) ? max_ab : max_cd;
assign min = ($unsigned(min_ab) > $unsigned(min_cd)) ? min_cd : min_ab;
endmodule