#include <bits/stdc++.h>   using namespace std;   const int dx[8] = {-2, -2, -1, -1, 1, 1, 2, 2};   const int dy[8] = {-1, 1, -2, 2, -2, 2, -1, 1};   int n, m;   int xw, yw, xb, yb;   int xtw, ytw, xtb, ytb;   deque<pair<int, int>> ww, wb, bw, bb;   int dist[1000][1000], parx[1000][1000], pary[1000][1000];   int crap;   void shortestWay(int sx, int sy, int tx, int ty, deque<pair<int, int>> &res) {     for (int i = 0; i < n; ++i)       for (int j = 0; j < m; ++j) dist[i][j] = -1;     dist[sx][sy] = 0;     queue<pair<int, int>> q;     q.push({sx, sy});     while (!q.empty()) {       int x = q.front().first, y = q.front().second;       q.pop();       if (x == tx && y == ty) break;       for (int i = 0; i < 8; ++i) {         int xx = x + dx[i], yy = y + dy[i];         if (xx < 0 || yy < 0 || xx >= n || yy >= m) continue;         if (dist[xx][yy] == -1) {           dist[xx][yy] = dist[x][y] + 1;           parx[xx][yy] = x, pary[xx][yy] = y;           q.push({xx, yy});         }       }     }     int cx = tx, cy = ty;     while (cx != sx || cy != sy) {       res.push_front({cx, cy});       int ccx = parx[cx][cy];       cy = pary[cx][cy];       cx = ccx;     }   }   void normal(deque<pair<int, int>> &way, int ox, int oy) {     for (int i = 0; i < way.size(); ++i) {       cout << way[i].first + 1 <<     << way[i].second + 1 <<   n  << flush;       if (way[i].first == ox && way[i].second == oy) exit(0);       if (i < way.size() - 1) {         cin >> ox >> oy;         ox--;         oy--;       }     }   }   void normalWhite() {     cout <<  WHITE n  << flush;     normal(ww, xb, yb);   }   void normalBlack() {     cout <<  BLACK n  << flush;     cin >> xw >> yw;     xw--;     yw--;     normal(bb, xw, yw);   }   void advanced(deque<pair<int, int>> &way, int x, int y, int tx, int ty, int ox,                 int oy) {     if (way.size() > 0) {       normal(way, ox, oy);       cin >> ox >> oy;       ox--;       oy--;       x = way.back().first, y = way.back().second;     }     for (int i = 0; i < 8; ++i) {       int xx = x + dx[i], yy = y + dy[i];       if (xx == ox && yy == oy) {         cout << xx + 1 <<     << yy + 1 <<   n  << flush;         exit(0);       }     }     deque<pair<int, int>> d;     if (tx > x) {       d.push_back({x + 1, y + 2});       d.push_back({x + 3, y + 1});       d.push_back({x + 1, y});     } else {       d.push_back({x - 1, y + 2});       d.push_back({x - 3, y + 1});       d.push_back({x - 1, y});     }     normal(d, ox, oy);   }   void advancedWhite() {     cout <<  WHITE n  << flush;     advanced(wb, xw, yw, xtw, ytw, xb, yb);   }   void advancedBlack() {     cout <<  BLACK n  << flush;     cin >> xw >> yw;     xw--;     yw--;     advanced(bw, xb, yb, xtb, ytb, xw, yw);   }   int main() {     cin >> n >> m >> xw >> yw >> xb >> yb;     xw--;     yw--;     xb--;     yb--;     xtw = n / 2 - 1;     ytw = m / 2 - 1;     xtb = n / 2;     ytb = m / 2 - 1;     shortestWay(xw, yw, xtw, ytw, ww);     shortestWay(xw, yw, xtb, ytb, wb);     shortestWay(xb, yb, xtw, ytw, bw);     shortestWay(xb, yb, xtb, ytb, bb);     if ((xw + yw) % 2 != (xb + yb) % 2) {       if (ww.size() <= bb.size())         normalWhite();       else if (wb.size() >= bb.size() + 2)         normalBlack();       else         advancedWhite();     } else {       if (bb.size() < ww.size())         normalBlack();       else if (bw.size() > ww.size())         normalWhite();       else         advancedBlack();     }   }