import java.util.Scanner;

public class Pract3 {
	public static void main(String[] args) {
		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();


		Medium(n, i_start, j_start, i_end, j_end);



		in.close();
	}

	private static void Medium(int n, int i_start, int j_start, int i_end, int j_end) {
		int combo=i_end-i_start;
		int combo2=j_end-j_start;
		int set=0;
		int set2=0;

		if((-1)*combo%2==0 && combo<0) {
			set=combo/(-2);
			if(combo2<0){

				set2=-1*(combo2+1*(set));
				if(set2%2==0){

					int tk=set2/2;
					int out=tk+set;
					System.out.println(out);
					for(int i=0;i<set;i++)
					{
						System.out.print("UL ");
					}
					for(int i=0;i<tk;i++)
					{  //L bhi aur R bhi
						System.out.print("L ");

					}
				}

				else
				{
					System.out.println("Impossible");
				}
			}
			else if(combo2==0)
			{
				// UR and UL concept -1 -- +1
			}
			else if(combo2>0)
			{
				//UL UR +1 only 
			}


		} 
		else if(combo%2==0 && combo>0) {
			//LL LR
			set=combo/2;//LR
			//			System.out.println(combo2);
			
			//			System.out.println(set2);
			//L and R
			if(combo2>0) {
				set2=(combo2-1*(set));
				if(set2%2==0 || combo2==2){//negativity not possible
					int maxu=set2/2;
					//L R
					if((set2+set)==combo2){
						System.out.println(set+maxu);
						for(int i=0;i<set;i++)
						{
							System.out.print("LR ");
						}
						for(int i=0;i<maxu;i++)
						{
							System.out.println("R ");
						}
					}
					else
					{
						System.out.print("Impossible");
					}



				}
			}
			else if(combo2<0){
				set2=((-1)*combo2-1*(set));
                if(set2%2==0 || combo2==-2)
                {
                	int maxu=set2/2;
					//L R
					if((set2+set)==combo2*(-1)){
						System.out.println(set+maxu);
						for(int i=0;i<set;i++)
						{
							System.out.print("LL ");
						}
						for(int i=0;i<maxu;i++)
						{
							System.out.println("L ");
						}
					}
					else
					{
						System.out.print("Impossible");
					}
                	
                }
                else
                {
                	System.out.println("Impossible");
                }

			}





		}
		else 
		{   //5105
			System.out.println("Impossible");


			//when combo2 is positive

		}


	}
}