integer a, b;
BEGIN
	READ a;
	READ b;
	IF a-1 = b +1 -> 
		IF a - 5 = 0 ->
			WRITE 0, a;
			IF a # b - (a  + 3) ->
				WRITE 1, b;
			[]
				WRITE 2, b;
			FI;
		[]
			SKIP;
		FI;
	[]
		SKIP;
	FI;
END.
