TASK

Problem

#58

Given chessboard coordinates `x` and `y` from 1 to 8, print `black` if the square is black and `white` otherwise. Square `(1,1)` is black.

EXAMPLE

Example

Input

1 1

Output

black

LIMITS

Constraints

1 ≤ x, y ≤ 8.

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LEARN Theory for this problem

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An `if` / `else if` / `else` chain checks alternatives from top to bottom. Put more specific or higher-priority conditions first.

Connection to “Chessboard Color”: here, intermediate values are best kept in named variables so the formula stays readable and data types remain clear.

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NEED HELP? Hints

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['List the possible cases and make them mutually exclusive.', 'After solving “Chessboard Color”, verify the algorithm on your own small example and on an allowed boundary case. Print only the required result with no extra text.']

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ANSWER Solution

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#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    int x, y;
    cin >> x >> y;
    cout << ((x + y) % 2 == 0 ? "black" : "white") << '\n';
    return 0;
}