#include<stdio.h>
#include<stdlib.h>

int main()
{
	int n,a,b,c,d,i,count=0;
	char ans[1000][2];
	scanf("%d",&n);
	scanf("%d %d %d %d",&a,&b,&c,&d);
	
	if((abs(c-a)%2)==1)
		printf("Impossible\n");
	else
	{
		while(!((c-a)==0) || !((d-b)==0))
		{
			if((abs(c-a)==2 && abs(d-b)==2) || (abs(c-a)==2 && (d-b)==0) )
			{
				printf("Impossible\n");
				exit(0);
			}
			else if(((c-a)==0 && (d-b)==-1) ||((c-a)==0 && (d-b)==1))
			{
				printf("Impossible\n");
				exit(0);
			}
			else if((c-a)==-4 && b==d)
			{
				a = a - 4;
				count = count + 1;
				ans[count][1] = 'U';
				ans[count][2] = 'L';
				count = count + 1;
				ans[count][1] = 'U';
				ans[count][2] = 'R';
			}
			else if((c-a)==4 && b==d)
			{
				a = a + 4;
				count = count + 1;
				ans[count][1] = 'L';
				ans[count][2] = 'R';
				count = count + 1;
				ans[count][1] = 'L';
				ans[count][2] = 'L';
			}
			else if(c<a && d<b)
			{
				//apply ul
				a = a - 2;
				b = b - 1;
				count = count + 1;
				ans[count][1] = 'U';
				ans[count][2] = 'L';

			}
			else if(c<a && d>b)
			{
				//apply ur
				a = a-2;
				b = b+1;
				count = count + 1;
				ans[count][1] = 'U';
				ans[count][2] = 'R';
			}
			else if(c==a && d>b)
			{
				//apply r
				b=b+2;
				count = count + 1;
				ans[count][1] = 'R';
				ans[count][2] = '\0';
			}
			else if(c>a && d>b)
			{
				// apply lr
				a = a + 2;
				b = b + 1;
				count = count + 1;
				ans[count][1] = 'L';
				ans[count][2] = 'R';
			}
			else if(c>a && d<b)
			{
				// apply ll
				a = a + 2;
				b = b - 1;
				count = count + 1;
				ans[count][1] = 'L';
				ans[count][2] = 'L';
			}
			else if(c==a && d<b)
			{
				// apply l
				b = b - 2;
				count = count + 1;
				ans[count][1] = 'L';
				ans[count][2] = '\0';
			}
		}
		printf("%d\n",count);
		for(i=1;i<=count;i++)
		{
			printf("%c%c ",ans[i][1],ans[i][2]);
		}
	}
}