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

int main()
{
   int i,j,k,l,q=0,m,n,d1,d2,s1,s2,hdiff,vdiff,hsteps,vsteps,c=0,d=0,hori,horisteps,steps=0,cont=0;
   int arr[1000];
   string s="";
   cin>>n;
   cin>>s1>>s2;
   cin>>d1>>d2;

   hdiff=fabs(s2-d2);
   vdiff=fabs(s1-d1);
   hsteps=hdiff/2;
   vsteps=vdiff/2;
   //cout<<hdiff<<endl;
   //cout<<vdiff<<endl;
   //cout<<hsteps<<endl<<vsteps<<endl;

    //impossible upper
      for(i=s1;i>d1;)
       {   //cout<<"uNBB";
           i-=2;
           if(s2%2==0)
           {  //cout<<"ueveN"<<endl;
               arr[i]=5;cont++;
               if(i>d1){
               i-=2;
               arr[i]=4;}
           }
            while(s2%2!=0 && i>d1)
           {  //cout<<"uodd"<<endl;
               arr[i]=4;cont++;
              // if(i>d1){
               i-=2;
               arr[i]=5;//}
           }
       }
       //impossible lower
        for(i=s1;i<d1;)
       {  //cout<<"i="<<i<<endl;
           //cout<<"lNBB";
           i+=2;
           //cout<<"i="<<i<<endl;
           if(s2%2==0)
           {  //cout<<"leveN"<<endl;
               arr[i]=5;cont++;
               if(i>d1){
               i+=2;
               //cout<<"i="<<i<<endl;
               arr[i]=4;}
           }
            while(s2%2!=0 && i<d1)
           {  //cout<<"lodd"<<endl;
               arr[i]=4;cont++;
               //if(i>d1){
               i+=2;
               //cout<<"asli i="<<i<<endl;
               arr[i]=5;//}
           }
       }
     //cout<<arr[d1]<<" "<<d2<<endl;
       if(arr[d1]%2!=d2%2 && cont!=0){cout<<"Impossible"; goto label;}
   //horizontal error
     //cout<<"hori";
      if(s2%2!=d2%2 && s1==d1){cout<<"Impossible";goto label;}
      //cout<<"hA";
     if(d1%2==0 && s1%2!=0){cout<<"Impossible"; goto label;}
     if(d1%2!=0 && s1%2==0){cout<<"Impossible"; goto label;}
     //upper left
   if(d1<s1 && d2<=s2)
   {
           for(i=0;i<hdiff;i++)
           {
                //cout<<"ul"<<" ";
                s=s+"UL"+" ";
                d++;
                c++;
                steps++;
                if(c>=vsteps)
                    break;
           }
           hdiff=hdiff-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
           {
               steps+=2;
            //cout<<"ul"<<" "<<"ur"<<" ";
            s=s+"UL"+" "+"UR"+" ";
           }
           for(i=0;i<hdiff;i+=2)
           {    steps++;
               //cout<<"L"<<" ";
               s=s+"L"+" ";
           }
           cout<<steps<<endl;
           cout<<s<<endl;

   }
   //u--right
   if(s1>d1 && s2<d2)
   {
        for(i=0;i<hdiff;i++)
           {
                //cout<<"UR"<<" ";
                s=s+"UR"+" ";
                d++;
                c++;
                steps++;
                if(c>=vsteps)
                    break;
           }
           hdiff=hdiff-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
           {
               steps+=2;
            //cout<<"ul"<<" "<<"ur"<<" ";
            s=s+"UL"+" "+"UR"+" ";
           }
           for(i=0;i<hdiff;i+=2)
           {   steps++;
               //cout<<"R"<<" ";
               s=s+"R"+" ";
           }
           cout<<steps<<endl;
   }
   //l--right
    if(s1<d1 && s2<=d2)
   {
           for(i=0;i<hdiff;i++)
           {
                //cout<<"LR"<<" ";
                s=s+"LR"+" ";
                d++;steps++;
                c++;
                if(c>=vsteps)
                    break;
           }
           hdiff=hdiff-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
           {
            //cout<<"LR"<<" "<<"LL"<<" ";steps+=2;
            s=s+"LR"+" "+"LL"+" ";steps+=2;
           }
           for(i=0;i<hdiff;i+=2)
           {
               //cout<<"R"<<" ";steps++;
               s=s+"R"+" ";steps++;
           }
           cout<<steps<<endl;
           cout<<s<<endl;
   }

   //l--left
     if(s1<d1 && s2>d2)
   {
           for(i=0;i<hdiff;i++)
           {
                //cout<<"LL"<<" ";
                s=s+"LL"+" ";
                d++;steps++;
                c++;
                if(c>=vsteps)
                    break;
           }
           hdiff=hdiff-c;
           vsteps-=d;
           for(i=0;i<vsteps;i+=2)
           {
            //cout<<"LR"<<" "<<"LL"<<" ";steps+=2;
            s=s+"LR"+" "+"LL"+" ";steps+=2;
           }
           for(i=0;i<hdiff;i+=2)
           {
               //cout<<"L"<<" ";steps++;
               s=s+"L"+" ";steps++;
           }
           cout<<steps<<endl;
           cout<<s<<endl;
   }
   //horizontal left
   if(s1==d1 && s2>d2 )
   {
       hori=fabs(s2-d2);
       horisteps=hori/2;
       for(i=0;i<horisteps;i++)
       {
           //cout<<"L"<<" ";steps++;
           s=s+"L"+" ";steps++;
       }
       cout<<steps<<endl;
       cout<<s<<endl;
   }
//horizontal right
 if(s1==d1 && s2<d2)
   {
       hori=fabs(s2-d2);
       horisteps=hori/2;
       for(i=0;i<horisteps;i++)
       {
           //cout<<"R"<<" ";steps++;
           s=s+"R"+" ";steps++;
       }
       cout<<steps<<endl;
       cout<<s<<endl;
   }
   label:
    return 0;
}