#include <iostream>
#include <vector>
#include <string>
 
using namespace std;
 
class simulator {
public:
	simulator(const vector<string> &board) {
		if (board.size() < 3) {
			throw invalid_argument("invalid board height");
		}
		if (board[0].size() < 3) {
			throw invalid_argument("invalid board width");
		}
		for (auto &row : board) {
			if (row.size() != board[0].size()) {
				throw invalid_argument("inconsistent board width");
			}
			vector<int> t;
			for (char ch : row) {
				if (ch == 'W') {
					t.push_back(0);
				}
				else if (ch == 'R') {
					t.push_back(1);
				}
				else {
					throw invalid_argument("invalid element");
				}
			}
			b.push_back(t);
		}
		x = -1;
		y = height() - 1;
		c = -1;
	}
 
	int height() const {
		return b.size();
	}
 
	int width() const {
		return b[0].size();
	}
 
	string history() const {
		return h;
	}
 
	bool red() const {
		return c == 1;
	}
 
	void move(const string &dirs, unsigned int repeat = 1) {
		while (repeat--) {
			for (auto d : dirs) {
				move(d);
			}
		}
	}
 
private:
	void move(char d) {
		switch (d) {
		case 'L': --x; break;
		case 'R': ++x; break;
		case 'U': --y; break;
		case 'D': ++y; break;
		default: throw invalid_argument("invalid direction");
		}
		c = b.at(y).at(x) = (b.at(y).at(x) + 1) % 2;
		h += d;
	}
 
	vector<vector<int>> b;
	int x, y, c;
	string h;
};
 
void sub(simulator &s) {
	for (int i = 0; i < s.width() - 1; ++i) {
		if (s.red()) {
			s.move("RDLU");
		}
		s.move("R");
	}
	if (s.red()) {
		s.move("DLLURDLURR");
	}
	s.move("D");
}
 
string solve(const vector<string> &board) {
	simulator s(board);
 
	s.move("R");
	s.move("U", s.height() - 1);
	for (int i = 0; i < s.height() - 2; ++i) {
		sub(s);
		s.move("D");
		s.move("L", s.width() - 1);
		s.move("U");
	}
	sub(s);
 
	for (int i = 0; i < s.width() - 1; ++i) {
		if (s.red()) {
			s.move("LUURDLURDD");
		}
		s.move("L");
	}
 
	if (s.red()) {
		s.move("URDLURD");
	}
 
	return s.history();
}
 
int main() {
	for (int h; (cin >> h) && (h >= 3); ) {
		vector<string> board(h);
		for (auto &s : board) {
			cin >> s;
		}
		string path = solve(board);
		for (auto &s : board) {
			cout << s << endl;
		}
		cout << "=> " << path.size() << " " << path << endl;
	}
}
 

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3
WWW
WWW
WWW
4
RRR
RRR
RRR
RRR
5
RWWWR
WRWWW
RWRWW
RWWRW
WRRWR
10
RWRWRWRWRW
WRWRWRWRWR
RWRWRWRWRW
WRWRWRWRWR
RWRWRWRWRW
WRWRWRWRWR
RWRWRWRWRW
WRWRWRWRWR
RWRWRWRWRW
WRWRWRWRWR
0