import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    public static void main(String[] args) {
        int count = 0;
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int i_start = in.nextInt();
        int j_start = in.nextInt();
        int i_end = in.nextInt();
        int j_end = in.nextInt();
        int row = (i_start - i_end);
        int col = (j_start - j_end);
       outer: if( row > 0 )
        {
            if(( row % 2 ) != 0 )
            {
                System.out.println("Impossible");
            }
         else if( ( row % 2 ) == 0 )
            {  if( (col - (row/2)) % 2 != 0 )
                   {
                       System.out.println("Impossible");
                       break outer;
                   }
               else
               {
                    count = ( row / 2) + (Math.abs(( col - (row/2)) / 2 ));
                
                   if( col > 0 )
                      {
                          System.out.println( count );
                          for( int i = 0 ; i < (row/2);i++ )
                           {
                             System.out.print("UL" + " ");                        
                           }
                           for( int j = 0 ; j < (( col - (row/2)) / 2); j++ )
                           {
                                System.out.print("L" + " ");  
                           }
                      }
                   else if( col < 0 )
                   {
                       System.out.println( count );
                          for( int i = 0 ; i < (row/2);i++ )
                           {
                             System.out.print("UR" + " ");                        
                           }
                           for( int j = 0 ; j < (( col - (row/2)) / 2); j++ )
                           {
                                System.out.print("R" + " ");  
                           }
                   }
               }
            }
        }
        else if( row < 0 )
        {  row = Math.abs(row);
            
            if(( row % 2 ) != 0 )
            {
                System.out.println("Impossible");
            }
            else if( ( row % 2) == 0 )
            {  if( (col - (row/2)) % 2 != 0 )
                   {
                       System.out.println("Impossible");
                        
                   }
               else
               {
                    count = ( row / 2) + (Math.abs(( col - (row/2)) / 2 ));
                
                   if( col > 0 )
                      {
                          System.out.println( count );
                          for( int i = 0 ; i < (row/2);i++ )
                           {
                             System.out.print("LL" + " ");                        
                           }
                           for( int j = 0 ; j < (( col - (row/2)) / 2); j++ )
                           {
                                System.out.print("L" + " ");  
                           }
                      }
                       
                   else if( col < 0 )
                   {
                       System.out.println( count );
                          for( int i = 0 ; i < (row/2);i++ )
                           {
                             System.out.print("LR" + " ");                        
                           }
                           for( int j = 0 ; j < (( col - (row/2)) / 2); j++ )
                           {
                                System.out.print("R" + " ");  
                           }
                   }
               }
            }
        }
        else if( row == 0 )
        {   if( col > 0 )
               { 
                  for( int i = 0 ; i < (col / 2); i++ )
                  {
                      System.out.println(col/2);
                      System.out.print("L" + " ");
                  }
               }
             else if( col < 0 )
             {
                 
                  for( int i = 0 ; i < (col / 2); i++ )
                  {
                      System.out.println(col/2);
                      System.out.print("R" + " ");
                  }
             }
        }
      
    }
                   
                
        
       
    }