#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main()
{
    int i,j,k,l,p,n,m;
    int UL,UR,LL,LR,L,R;
    int xi,yi,xf,yf;
    scanf("%d",&n);
    int A[n];
    scanf("%d %d %d %d",&yi,&xi,&yf,&xf);
    int pathx=xf-xi,pathy=yf-yi;
    if(abs(pathy)%4!=0)
    {
        printf("Impossible");
        return;
    }
    if(pathy==0)
    {
        int flag=0;
        if(abs(pathx)%2!=0)
        {
            printf("Impossible");
            return;
        }
        else 
        {
            if (pathx<0){
                flag=1;
                pathx=-pathx;
            }
            printf("%d\n",pathx/2);
            for(i=0;i<(pathx/2);i++)
            {
                if(flag==0)printf("R ");
                else printf("L ");
            }

        }
    }
    if(pathx==0)
    {
        int dir=0;
        if(abs(pathy)%4!=0)
        {
            printf("Impossible");
            return;
        }
        if(pathy<0)
        {
            dir=1;
            pathy=-pathy;
        }
        
        
        
            printf("%d\n",pathy/2);
            for(i=0;i<pathy/4;i++)
            {
                if(dir==1)printf("UL ");
                if(dir==0)printf("LR ");
            }
            for(i=0;i<pathy/4;i++)
            {
                if(dir==1)printf("UR ");
                
                if(dir==0)printf("LL ");
            }
            
            
        
    }
    
    
    
    
    
}