module ex7_top(
	KEY,
	HEX0,
	HEX1
);

	input [3:0] KEY;
	output [6:0] HEX0, HEX1;
	reg [6:0] SHIFT;
	initial SHIFT = 7'd1;
	
	always @ (posedge KEY[3])
		SHIFT <= {SHIFT[5:0],SHIFT[6] ^ SHIFT[0]};
		
	hex_to_7seg SEG0 (HEX0,SHIFT[3:0]);
	hex_to_7seg SEG1 (HEX1,SHIFT[6:4]);

	

endmodule