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