#include <iostream>
#include <cstdio>
#include <string>

using namespace std;

inline int abs(int a) {
	return a < 0 ? -a : a;
}

int main() {
	int N, startI, startJ, endI, endJ;
	cin >> N;
	scanf("%d %d %d %d", &startI, &startJ, &endI, &endJ);

	string rowDir = "", colDir = "", colDirOp = "";
	if (endI - startI > 0) rowDir = "L";
	else if (endI - startI < 0) rowDir = "U";

	if (endJ - startJ > 0) colDir = "R", colDirOp = "L";
	else if (endJ - startJ < 0) colDir = "L", colDirOp = "R";

	bool isAble = true;
	int crossFirst=0, crossSecond=0, directCnt=0;
	if (abs(endI - startI) % 2 == 0) {
		int rowCnt = abs(endI - startI) / 2;
		int colCnt = abs(endJ - startJ);
		if (abs(rowCnt - colCnt) % 2 == 0) {
			if (colCnt > rowCnt) {
				if ((colCnt - rowCnt) % 2 == 0) {
					directCnt = (colCnt - rowCnt) / 2;
					crossFirst = rowCnt;
				}
				else {
					isAble = false;
				}
			}
			else {
				crossFirst = rowCnt - (rowCnt - colCnt) / 2;
				crossSecond = (rowCnt - colCnt) / 2;
			}
		}
		else {
			isAble = false;
		}
	}
	else {
		isAble = false;
	}

	if (!isAble) cout << "Impossible" << '\n';
	else {
		cout << crossFirst + crossSecond + directCnt << '\n';

		if (rowDir == "L") {
			if (colDir == "R") {
				for (int i = 0; i < directCnt; i++) cout << colDir << " ";
				for (int i = 0; i < crossFirst; i++) cout << rowDir << colDir << " ";
				for (int i = 0; i < crossSecond; i++) cout << rowDir << colDirOp << " ";
			}
			else if (colDir == "L") {
				for (int i = 0; i < crossSecond; i++) cout << rowDir << colDirOp << " ";
				for (int i = 0; i < crossFirst; i++) cout << rowDir << colDir << " ";
				for (int i = 0; i < directCnt; i++) cout << colDir << " ";
			}
			else {
				for (int i = 0; i < crossFirst; i++) cout << "LR ";
				for (int i = 0; i < crossSecond; i++) cout << "LL ";
			}
		}
		else {
			if (colDir == "R") {
				for (int i = 0; i < crossSecond; i++) cout << rowDir << colDirOp << " ";
				for (int i = 0; i < crossFirst; i++) cout << rowDir << colDir << " ";
				for (int i = 0; i < directCnt; i++) cout << colDir << " ";
			}
			else if (colDir == "L") {
				for (int i = 0; i < crossFirst; i++) cout << rowDir << colDir << " ";
				for (int i = 0; i < crossSecond; i++) cout << rowDir << colDirOp << " ";
				for (int i = 0; i < directCnt; i++) cout << colDir << " ";
			}
			else {
				for (int i = 0; i < crossFirst; i++) cout << "UL ";
				for (int i = 0; i < crossSecond; i++) cout << "UR ";
			}
		}

		cout << '\n';
	}
}