#include<stdio.h>
void imp()
{
	printf("Impossible");
}
void imp();
int main()
{
	int start1,start2,end1,end2,n,i,j,f=1,s1,s2;
	scanf("%d",&n);
	scanf("%d %d %d %d",&start1,&start2,&end1,&end2);
	i=0,j=1;
	
			while(start1+j<n||start1-j>=0)
			{
				i++;
				if((start1+i)==end1)
				{
					f=0;
					imp();
				}		    
				else if((start1-i)==end1)
				{
				   f=0;
				   imp();
			   }
				else if((start1+j)==end1 && (start2+j)==end2)
				   {
					   f=0;
					   imp();
					   
				   }
				else if((start1-j)==end1 && (start2-j)==end2)
					{
						f=0;
					imp();
					}
			    else if(start1==end1 && (start2+1)==end2)
			    { 
					f=0;
					imp();
				}
				else if(start1==end1 && (start2-1)==end2)
			    { 
					f=0;
					imp();
				}
				 
			    i++; 
			    j++; 
	         }
	         if(f==1)
	         {
				if(end1<start1 && end2<start2)
				 {
					 s1=(start1-end1)/2;
					 s2=(start2-end2-s1)/2;
					 printf("%d\n",s1+s2);
					 for(i=0;i<s1;i++)
					      printf("UL ");
					 for(i=0;i<s2;i++)
					      printf("L ");
					 
				 }
				 else if(end1<start1 && end2>start2)
				 {
					 s1=(start1-end1)/2;
					 s2=(end2-start2-s1)/2;
					 printf("%d\n",s1+s2);
					 for(i=0;i<s1;i++)
					      printf("UR ");
					 for(i=0;i<s2;i++)
					      printf("R "); 
				 }
				 else if(end1>start1 && end2<start2)
				 {
					 s1=(end1-start1)/2;
					 s2=(start2-end2-s1)/2;
					 printf("%d\n",s1+s2);
					 for(i=0;i<s1;i++)
					      printf("LL ");
					 for(i=0;i<s2;i++)
					      printf("L ");	 
				 }
				  else if(end1>start1 && end2>start2)
				 {
					 s1=(end1-start1)/2;
					 s2=(end2-start2-s1)/2;
					 printf("%d\n",s1+s2);
					 for(i=0;i<s1;i++)
					      printf("LR ");
					 for(i=0;i<s2;i++)
					      printf("R "); 
				 }
				 else if(start1==end1 && end2>start2)
				 {
					 s1=(end2-start2)/2;
					 printf("%d\n",s1);
					 for(i=0;i<s1;i++)
					      printf("R "); 
					 
				 }
				 else if(start1==end1 && end2<start2)
				 {
					 s1=(start2-end2)/2;
					 printf("%d",s1);
					 for(i=0;i<s1;i++)
					      printf("L "); 
					 
				 }
				 else if((end2==start2)&& start1<end1)
				 {
					 s1=(end1-start1)/2;
					 printf("%d\n",s1);
					 for(i=0;i<s1;i=i+2)
					      printf("LR LL ");  
				 }
				  else if((end2==start2)&& start1>end1)
				 {
					 s1=(start1-end1)/2;
					 printf("%d\n",s1);
					 for(i=0;i<s1;i=i+2)
					      printf("UL UR ");  
				 }
				 
				 
			 }
	
	
  return 0;
}