Problem:
Problem Statement

You are given two integers a and b (a≤b). Determine if the product of the integers a, a+1, …, b is positive, negative or zero.

Constraints

a and b are integers.

-10^9≤a≤b≤10^9

Partial Score

In test cases worth 100 points, -10≤a≤b≤10.

Input

The input is given from Standard Input in the following format:

a b

Output

If the product is positive, print Positive. If it is negative, print Negative. If it is zero, print Zero.

Sample Input 1

1 3

Sample Output 1

Positive

1×2×3=6 is positive.

Sample Input 2

-3 -1

Sample Output 2

Negative

(-3)×(-2)×(-1)=-6 is negative.

Sample Input 3

-1 1

Sample Output 3

Zero

(-1)×0×1=0.

Solution in Pascal (FPC 2.6.2) (judge verdict: Accepted)

var
 n,a,b,i:longint;
begin
 read(a,b); n:=1;
 for i:=a to b do
  if i=0 then begin writeln('Zero'); halt; end
   else if i<0 then n:=-n;
 if n=1 then writeln('Positive')
  else writeln('Negative');
end.