/* p5.cpp

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

//guzixi ak csp-j
//guzixi ak csp-s
//guzixi ak noip
//guzixi ak shenxuan
//guzixi ak noi
//guzixi ak wc
//guzixi ak ctsc
//guzixi ak ioi
//guzixi ak xxywl

//while(1) rp+=1145141919810;

#include <bits/stdc++.h>
//#include <bits\stdc++.h>
using namespace std;
int a[222][222],x=111,y=111,mi_x=111,
                ma_x=111,mi_y=111,ma_y=111;
int d[4][2]= {1,0,0,1,-1,0,0,-1},nd;
string xxx;
int left() {
	cout<<"LEFT"<<endl;
	nd=(nd+1)%4;
	cin>>xxx;
	return nd;
}
bool go() {
	cout<<"GO"<<endl;
	cin>>xxx;
	return xxx=="SUCC";
}
void dfs(int dd){
	x-=d[dd][0],y-=d[dd][1];
	while(left()!=0);
	for(int i=0;i<4;i++){
		if(a[x+d[i][0]][y+d[i][1]]==0){
			if(go()){
				mi_x=min(mi_x,x+d[i][0]);
				mi_y=min(mi_y,y+d[i][1]);
				ma_x=max(ma_x,x+d[i][0]);
				ma_y=max(ma_y,y+d[i][1]);
				a[x+d[i][0]][y+d[i][1]]=1;
				dfs((i+2)%4);
			}
			else a[x+d[i][0]][y+d[i][1]]=-1;
		}
		left();
	}
	while(left()!=dd);
	go();
	while(left()!=(dd+2)%4);
	x+=d[dd][0],y+=d[dd][1];
}
void mian() {
	dfs(nd);
	cout << "END" << endl;
	cout << ma_x-mi_x+1 << " " << ma_y-mi_y+1 << endl;
	for (int i = mi_x; i <= ma_x; i++) {
		for (int j = mi_y; j <= ma_y; j++) {
			if(a[i][j]==1)cout<<'.';
			else cout<<'#';
		}
		cout << endl;
	}
}
int main() {
	string s;
	cout<<"LEFT"<<endl;
	cin>>s;
	if(s=="W")nd=3;
	if(s=="E")nd=1;
	if(s=="S")nd=0;
	else nd=2;
	mian();
	return 0;
}
void man();
//guzixi luogu uid = 1124559, welcome
//love ccf, love jiangsu