#include <stdio.h>

#define TRUE 1
#define FALSE 0

int CheckReachable(int,int,int,int);

int main(){

    int BoardLength;
    int CurrentX, CurrentY;
    int FinalX, FinalY;
    int Reachable,c,d;
    int StoreMovement[150] = {0};

    scanf("%d", &BoardLength);
    scanf("%d %d %d %d", &CurrentX, &CurrentY, &FinalX, &FinalY);

    Reachable = CheckReachable(CurrentX,CurrentY,FinalX,FinalY);

    if (Reachable == 1){

        c = 0;
        while ( !((CurrentX==FinalX) && (CurrentY==FinalY)) ){

            if (CurrentX == FinalX){
                if (CurrentY < FinalY){
                    //Move R
                    CurrentY = CurrentY + 2;
                    StoreMovement[c] = 1;
                }
                else {
                    //Move L
                    CurrentY = CurrentY - 2;
                    StoreMovement[c] = 0;
                }
            }
            else if (CurrentX < FinalX){
                if (CurrentY < FinalY){
                    //Move LR
                    CurrentY = CurrentY + 1;
                    CurrentX = CurrentX + 2;
                    StoreMovement[c] = 3;
                }
                else if (CurrentY > FinalY){
                    //Move LL
                    CurrentY = CurrentY - 1;
                    CurrentX = CurrentX + 2;
                    StoreMovement[c] = 2;
                }
                else {
                    if (CurrentY == 0){
                        //Move LR
                        CurrentY = CurrentY + 1;
                        CurrentX = CurrentX + 2;
                        StoreMovement[c] = 3;
                    }
                    else {
                        //Move LL
                        CurrentY = CurrentY - 1;
                        CurrentX = CurrentX + 2;
                        StoreMovement[c] = 2;
                    }
                }
            }
            else if (CurrentX > FinalX){
               if (CurrentY < FinalY){
                    //Move UR
                    CurrentY = CurrentY + 1;
                    CurrentX = CurrentX - 2;
                    StoreMovement[c] = 5;
                }
                else if (CurrentY > FinalY){
                    //Move UL
                    CurrentY = CurrentY -1;
                    CurrentX = CurrentX -2;
                    StoreMovement[c] = 4;
                }
                else {
                    if (CurrentY == 0){
                        //Move UR
                        CurrentY = CurrentY + 1;
                        CurrentX = CurrentX - 2;
                        StoreMovement[c] = 5;
                    }
                    else {
                        //Move UL
                        CurrentY = CurrentY -1;
                        CurrentX = CurrentX -2;
                        StoreMovement[c] = 4;
                    }
                }
            }

            c++;
        }

        printf("%d\n", c);
        for (d=0;d<c;d++){
            if (StoreMovement[d]==0){
                printf("L ");
            }
            else if (StoreMovement[d]==1){
                printf("R ");
            }
            else if (StoreMovement[d]==2){
                printf("LL ");
            }
            else if (StoreMovement[d]==3){
                printf("LR ");
            }
            else if (StoreMovement[d]==4){
                printf("UL ");
            }
            else {
                printf("UR ");
            }
        }

    }
    else {
        printf("Impossible");
    }

return 0;
}

int CheckReachable(int CurrentX, int CurrentY, int FinalX, int FinalY){

    int Reachable;

    if ((CurrentX%2) == (FinalX%2)){
        if ( ( ((FinalX-CurrentX)%4) ==0) && (((CurrentY-FinalY)%2)==0) ){
            Reachable = TRUE;
        }
        else if ( (CurrentX-FinalX) % 4 !=0 && (CurrentY + 1 - FinalY) % 2 == 0 ){
            Reachable = TRUE;
        }
        else {
            Reachable = FALSE;
        }
    }
    else {
        Reachable = FALSE;
    }

    return Reachable;
}