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 C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>

int main(void)
{
    int a, b, seki, i;

    scanf("%d %d", &a, &b);

    //if( a > b ) return 0;
    seki = a;
    for( i = 1; a + i <= b; i++ )
    {
        seki *= (a + i);
        //printf("%d\n", seki);
    }
    
    if( seki == 0 ) puts( "Zero" );
    else if( seki > 0 ) puts( "Positive" );
    else puts( "Negative" );

    return 0;

}