c[1<<20],d[1<<20],a[2],h[2],q;main(i){for(scanf("%d%d%*d",h+1,h);~scanf("\n%c%d",c+i,d+i);i++);for(;--i;)a[q=c[i]&1]==d[i]?a[1-q]=(a[1-q]+h[q]-1)%h[q]:0;*a=!printf(*a+a[1]&1?"black":"white");}