#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

// UL, UR, R, LR, LL, L.

void goUL(int& x1, int& y1, int& x2, int& y2, vector<string>& steps) {
   while (x1 > x2 && y1 > y2) {
       steps.emplace_back("UL");
       x1--;
       y1 -= 2;
   }
}

void goUR(int& x1, int& y1, int& x2, int& y2, vector<string>& steps) {
   while (x1 < x2 && y1 > y2) {
       steps.emplace_back("UR");
       x1++;
       y1 -= 2;
   }
}

void goR(int& x1, int& x2, vector<string>& steps) {
    while (x1 < x2) {
        steps.emplace_back("R");
        x1 += 2;
    }
}

void goLR(int& x1, int& y1, int& x2, int& y2, vector<string>& steps) {
   while (x1 < x2 && y1 < y2) {
       steps.emplace_back("LR");
       x1++;
       y1 += 2;
   }
}

void goLL(int& x1, int& y1, int& x2, int& y2, vector<string>& steps) {
   while (x1 > x2 && y1 < y2) {
       steps.emplace_back("LL");
       x1--;
       y1 += 2;
   }
}

void goL(int& x1, int& x2, vector<string>& steps) {
    while (x1 > x2) {
        steps.emplace_back("L");
        x1 -= 2;
    }
}

void goU(int& x1, int l, int& y1, int& y2, vector<string>& steps) {
    while(y1 > y2) {
        if (x1 > l) {
            steps.emplace_back("UL");
            steps.emplace_back("UR");
        }
        else {
            steps.emplace_back("UR");
            steps.emplace_back("UL");
        }
        y1 -= 4;
    }
}

void goD(int& x1, int r, int& y1, int& y2, vector<string>& steps) {
    while(y1 < y2) {
        if (x1 < r) {
            steps.emplace_back("LR");
            steps.emplace_back("LL");
        }
        else {
            steps.emplace_back("LL");
            steps.emplace_back("LR");
        }
        y1 += 4;
    }
}

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n, x1, y1, x2, y2;
    cin >> n >> y1 >> x1 >> y2 >> x2;
    int h = abs(y1 - y2), w = abs(x1 - x2);
    if (h % 2) {
        cout << "Impossible" << endl;
        return 0;
    }
    if ((h % 4  && w % 2 == 0) || (h % 4 == 0 && w % 2)) {
        cout << "Impossible" << endl;
        return 0;
    }
    
    vector<string> steps;
    
    if (x1 < x2 && y1 < y2) goLR(x1, y1, x2, y2, steps);
    else if (x1 < x2 && y1 > y2) goUR(x1, y1, x2, y2, steps);
    else if (x1 > x2 && y1 > y2) goUL(x1, y1, x2, y2, steps);
    else if (x1 > x2 && y1 < y2) goLL(x1, y1, x2, y2, steps);
    // cout << endl << "----------------------------------------1" << endl;
    
    goL(x1, x2, steps);
    // cout << endl << "----------------------------------------2" << endl;
    goR(x1, x2, steps);
    // cout << endl << "----------------------------------------3" << endl;
    goU(x1, 0, y1, y2, steps);
    // cout << endl << "----------------------------------------4" << endl;
    goD(x1, n - 1, y1, y2, steps);
    // cout << endl << "----------------------------------------5" << endl;
    
    cout << steps.size() << endl;
    for (auto &s : steps) cout << s << " ";
    cout << endl;
    
    return 0;
}