http://47.96.116.66/problem.php?cid=1177&pid=6

http://47.96.116.66/problem.php?cid=1180&pid=6

题解：博弈论

/*
*@Author:   STZG
*@Language: C++
*/
#include <bits/stdc++.h>
#include<iostream>
#include<algorithm>
#include<cstdlib>
#include<cstring>
#include<cstdio>
#include<string>
#include<vector>
#include<bitset>
#include<queue>
#include<deque>
#include<stack>
#include<cmath>
#include<list>
#include<map>
#include<set>
//#define DEBUG
#define RI register int
using namespace std;
typedef long long ll;
//typedef __int128 lll;
const int N=100000+10;
const int M=100000+10;
const int MOD=1e9+7;
const double PI = acos(-1.0);
const double EXP = 1E-8;
const int INF = 0x3f3f3f3f;
int t,n,m,k,q;
int ans,cnt,flag,temp,sum;
int a[N];
char str;
struct node{};
int main()
{
#ifdef DEBUG
	freopen("input.in", "r", stdin);
	//freopen("output.out", "w", stdout);
#endif
    //ios::sync_with_stdio(false);
    //cin.tie(0);
    //cout.tie(0);
    //scanf("%d",&t);
    //while(t--){
    int x,y,x2,y2;
    scanf("%d%d%d%d",&x,&y,&x2,&y2);
    if(abs(x-x2)%2==0&&abs(y-y2)%2==0||abs(x-x2)%2==1&&abs(y-y2)%2==1){
            cout<<"black"<<endl;
    }else if(abs(x-x2)%2==0&&abs(y-y2)%2==1||abs(x-x2)%2==1&&abs(y-y2)%2==0){
        cout<<"white"<<endl;
    }else{
        cout<<"draw"<<endl;
    }
    //}

#ifdef DEBUG
	printf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC);
#endif
    //cout << "Hello world!" << endl;
    return 0;
}