h[2],a[2],q;f(c,d){~scanf(" %c%d",&c,&d)&&f();a[q=c&1]-d?:!a[1-q]--?a[1-q]+=h[q]:0;}main(){f(scanf("%d%d%*d",h+1,h));puts(*a+a[1]&1?"black":"white");}