unittest
{
	assert( [ "1 3" ].parse.expand.solve == "Positive" );
	assert( [ "-3 -1" ].parse.expand.solve == "Negative" );
	assert( [ "-1 1" ].parse.expand.solve == "Zero" );
	
	assert( [ "-4 -1" ].parse.expand.solve == "Positive" );		// 追加ケース
}



import std.conv;
import std.range;
import std.stdio;
import std.typecons;

void main()
{
	stdin.byLineCopy.parse.expand.solve.writeln;
}

auto parse( Range )( Range input )
if( isInputRange!Range && is( ElementType!Range == string ) )
{
	auto ab = input.front.split.to!( long[] );
	return tuple( ab[ 0 ], ab[ 1 ] );
}

auto solve( long a, long b )
{
	if( a <= 0 && 0 <= b ) return "Zero";
	if( b < 0 && ( a - b ) % 2 == 0 ) return "Negative";
	else                              return "Positive";
}
