#!/bin/sh
read a b
n=0
if [ "${a::1}" = "-" -a  "${b::1}" != "-" ]
then
	echo Zero
elif [ "${a::1}" = "-" -a  "${b::1}" = "-" ]
then
	n=$(( b - a ))
	[[ "$(( n % 2 ))" = "1" ]] && echo Positive
	[[ "$(( n % 2 ))" = "0" ]] && echo Negative
else
	echo Positive
fi