#include<iostream>
#include<bits/stdc++.h>
using namespace std;

int main()
{
   int i,N,de2,de1,so2,so1,vd,hd,hsteps,vsteps,c=0,d=0,hori,zsteps,t=0,ct=0;
   int ara[1000];
   string s="";
   cin>>N;
   cin>>so1>>so2;
   cin>>de1>>de2;

   hd=fabs(so2-de2);
   vd=fabs(so1-de1);
   hsteps=hd/2;
   vsteps=vd/2;

      for(i=so1;i>de1;)
       {   i-=2;
           if(so2%2==0)
           {  ara[i]=7;
           ct++;
               if(i>de1){
               i-=2;
               ara[i]=6;}
           }
            while(so2%2!=0 && i>de1)
           {  ara[i]=6;
              ct++;
               i-=2;
               ara[i]=7;
           }
       }
        for(i=so1;i<de1;)
       {  i+=2;
           if(so2%2==0)
           {  ara[i]=7;
              ct++;
               if(i>de1){
               i+=2;
               ara[i]=6;}
           }
            while(so2%2!=0 && i<de1)
           {  ara[i]=6;
              ct++;
               i+=2;
               ara[i]=7;}
       }
       if(ara[de1]%2!=de2%2 && ct!=0){cout<<"Impossible"; goto stable;}
      if(so2%2!=de2%2 && so1==de1){cout<<"Impossible";goto stable;}
     if(de1%2==0 && so1%2!=0){cout<<"Impossible"; goto stable;}
     if(de1%2!=0 && so1%2==0){cout<<"Impossible"; goto stable;}
   if(de1<so1 && de2<=so2)
   {
           for(i=0;i<hd;i++)
           {s=s+"UL"+" ";
                d++;
                c++;
                t++;
                if(c>=vsteps)
                    break;
           }
           hd=hd-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
           {t+=2;
            s=s+"UL"+" "+"UR"+" ";
           }
           for(i=0;i<hd;i+=2)
           {    t++;
               s=s+"L"+" ";
           }
           cout<<t<<endl;
           cout<<s<<endl;
       }
   if(so1>de1 && so2<de2)
     {
        for(i=0;i<hd;i++)
             {
                s=s+"UR"+" ";
                d++;
                c++;
                t++;
                if(c>=vsteps)
                    break;
           }
           hd=hd-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
           {
               t+=2;
            s=s+"UL"+" "+"UR"+" ";
           }
           for(i=0;i<hd;i+=2)
           {   t++;
               s=s+"R"+" ";
           }
           cout<<t<<endl;
   }
    if(so1<de1 && so2<=de2)
   {
           for(i=0;i<hd;i++)
           {    s=s+"LR"+" ";
                d++;t++;
                c++;
                if(c>=vsteps)
                    break;
           }
           hd=hd-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
              {
            s=s+"LR"+" "+"LL"+" ";t+=2;
                  }
           for(i=0;i<hd;i+=2)
                 {
               s=s+"R"+" ";t++;
               }
           cout<<t<<endl;
           cout<<s<<endl;
   }
     if(so1<de1 && so2>de2)
   {
           for(i=0;i<hd;i++)
           {    s=s+"LL"+" ";
                d++;t++;
                c++;
                if(c>=vsteps)
                    break;
           }
           hd=hd-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
           {
            s=s+"LR"+" "+"LL"+" ";t+=2;
           }
           for(i=0;i<hd;i+=2)
             {
               s=s+"L"+" ";t++;
             }
           cout<<t<<endl;
           cout<<s<<endl;
   }
   if(so1==de1 && so2>de2 )
   {
       hori=fabs(so2-de2);
       zsteps=hori/2;
       for(i=0;i<zsteps;i++)
       {
        s=s+"L"+" ";t++;
       }
       cout<<t<<endl;
       cout<<s<<endl;
   }
 if(so1==de1 && so2<de2)
   {
       hori=fabs(so2-de2);
       zsteps=hori/2;
       for(i=0;i<zsteps;i++)
       {
           s=s+"R"+" ";t++;
       }
       cout<<t<<endl;
       cout<<s<<endl;
   }
   stable:
    return 0;
}