#include <iostream>
#include <map>
#include <string>
#include <map>
#include <set>
#include <vector>

using namespace std;

int main(int argc, char * * argv) {
	map<int, double> stavy1;
	map<int, double> stavy2;
	
	int x;
	int beg=0;
	for(int i=0;i<4;i++) {
		cin>>x;
		beg+=x;
		if(i<3)
			beg<<=8;
	}
	
	stavy1.insert({beg, 1.0});
	
	vector<double> prs(2);
	int pl=0; // 0 white, 1 black
	
	while(true) {
		// move
		for(auto && s: stavy1) {
			// if(s.second==0) continue; // WTF
			
			int stav=s.first;
			int x,y, x2, y2;
			
			if(pl==0) {
				x=(stav>>24)&255;
				y=(stav>>16)&255;
				x2=(stav>>8)&255;
				y2=(stav)&255;
			}else{
				x2=(stav>>24)&255;
				y2=(stav>>16)&255;
				x=(stav>>8)&255;
				y=(stav)&255;
			}

			int no_news=0;
			
			set<pair<int,int>> tahy = { {-2, -1}, 
										{-2, +1}, 
										{+2, -1}, 
										{+2, +1}, 
										{-1, -2}, 
										{-1, +2}, 
										{+1, -2}, 
										{+1, +2} };

			for(auto && t: tahy) {
				int nx,ny;
				nx=x+t.first;
				ny=y+t.second;
				if(nx>=1 && nx<=8 && ny>=1 && ny<=8)
					no_news++;
			}

			for(auto && t: tahy) {
				int nx,ny;
				nx=x+t.first;
				ny=y+t.second;
				if(nx>=1 && nx<=8 && ny>=1 && ny<=8) {
					int newState=0;
					if(pl==0) {
						newState+=nx<<24;
						newState+=ny<<16;
						newState+=x2<<8;
						newState+=y2;
					}else{
						newState+=x2<<24;
						newState+=y2<<16;
						newState+=nx<<8;
						newState+=ny;
					}

					//cout<<nx<<" "<<ny<<" "<<newState<<"AAAAA"<<endl;

					if(nx==x2 && ny==y2) {
					//cout<<"PLUS"<<s.second/no_news<<" "<<pl<<endl;
						prs[pl]+=s.second/no_news;
					}else
					stavy2[newState]+=s.second/no_news;
				}
			}

		}
		
		// sum
		double sum=0.0;
		for(auto && s: stavy2) {
			sum+=s.second;
		}
		
		if(sum<0.000001) break;

		pl=1-pl;


		stavy1=std::move(stavy2);
		stavy2.clear();
	}

	//cout<<prs[0]<<' '<<prs[1];

	if(prs[0]<prs[1]) cout<<"black"<<endl;
	else cout<<"white"<<endl;
	
	return 0;
}