How do you plan to solve it?
I planned to solve it by directly connecting the input a to all three outputs.Since this is just a fan-out connection, I used continuous assignments so that y1, y2, and y3 always follow the value of a.
module top_module(a,y1,y2,y3); input a; output y1,y2,y3; assign y1 = a; assign y2 = a; assign y3 = a; endmodule