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

int main() {
    int n;
    cin >> n;
    
    int is, js, ie, je;
    cin >> is >> js >> ie >> je;
    
    int rowDiff = (ie > is) ? ie - is : is - ie;
    if (rowDiff % 2 != 0) {
        cerr << "RowDiff = " << rowDiff << "\n";
        
        cout << "Impossible";
        return 0;
    }
    else {  
        int colDiff = (je > js) ? je - js : js - je;
        if (rowDiff % 4 == 0) {
            if (colDiff % 2 != 0) {
                cerr << "RowDiff = " << rowDiff << " ColDiff = " << colDiff << "\n";
                
                cout << "Impossible";
                return 0;
            }
        }
        else {
            if (colDiff % 2 == 0) {
                cerr << "RowDiff = " << rowDiff << " ColDiff = " << colDiff << "\n";
                
                cout << "Impossible";
                return 0;
            }
        }
    }
    
    int moveCount = 0;
    vector<string> moves;
    
    while (is != ie || js != je) {
        moveCount++;
        
        if (ie < is) {
            if (je <= js) {
                moves.push_back("UL");
                is -= 2;
                js--;
            }
            else {
                int rowDiff = is - ie;
                if (je - js < rowDiff / 2) {
                    moves.push_back("UL");
                    is -= 2;
                    js--;
                }
                else {
                    moves.push_back("UR");
                    is -= 2;
                    js++;
                }
            }
        }
        else if (ie > is) {
            if (je >= js) {
                int rowDiff = ie - is;
                if (je - js > rowDiff / 2) {
                    moves.push_back("R");
                    js += 2;
                }
                else {
                    moves.push_back("LR");
                    is += 2;
                    js++;
                }
            }
            else {
                moves.push_back("LL");
                is += 2;
                js--;
            }
        }
        else {  //OK
            if (je < js) {
                moves.push_back("L");
                js -= 2;
            }
            else if (je > js) {
                moves.push_back("R");
                js += 2;
            }
        }
    }
    
    cout << moveCount << "\n";

    vector<string> priority { "UL", "UR", "R", "LR", "LL", "L" };
    for (auto jt = priority.begin(), jend = priority.end(); jt != jend; ++jt) {
        string cur = *jt;
        
        for (auto it = moves.begin(), end = moves.end(); it != end; ++it) {
            if (*it != cur)
                continue;
            
            cout << *it << " ";
        }
    }
    
    return 0;
}