#include<bits/stdc++.h>
using namespace std;
int main()
{   int i,j,k,n,m;
int i1,i2,j1,j2,o=0;
cin>>n;
cin>>i1>>j1>>i2>>j2;
vector<string>v;
v.clear();
while((i1!=i2 || j1!=j2) && (i1>=0&&j1>=0) && (i1<=n-1 && j1<=n-1) )
{
    if(i1-i2>=2)
    {
      if(j1-j2 >=1)
        {
        v.push_back("UL");
        i1-=2;
        j1-=1;
         }
        else if(j2-j1>=1)
        {
             v.push_back("UR");
            i1-=2;
            j1+=1;
            o=1;
        }
        else if(j1==j2)
        {
                     while(i1!=i2)
                     {
                         v.push_back("UL");
                         i1-=2;
                         j1-=1;
                         if(i1!=i2){v.push_back("UR");i1-=2;j1+=1;}
                     }
                     while(j2!=j1)
                     {
                         v.push_back("R");
                         j1+=2;
                     }
                }
    }
    else if(i2==i1)
        {     if(j1-j2>=2){
                    v.push_back("L");
                    j1-=2;
                    o=1;
                     }
                else if(j2-j1>=2)
                {
                    v.push_back("R");
                    j1+=2;
                    o=1;
                }
                else
                {
                    o=3;break;
                }
 }
else if(i2-i1>=2)
{
            if(j1-j2 >=1){
                v.push_back("LL");
                i1+=2;
                j1-=1;
                 }
                else if(j2-j1>=1)
                {
                     v.push_back("LR");
                    i1+=2;
                    j1+=1;
                    o=1;
                }
                else if(j1==j2)
                {
                     while(i1!=i2)
                     {
                         v.push_back("LR");
                         i1+=2;
                         j1+=1;
                         if(i1!=i2){v.push_back("LL");i1+=2;j1-=1;}
                     }
                     while(j2!=j1)
                     {
                         v.push_back("L");
                         j1-=2;
                     }
                }

    }
else
{
    o=3;
    break;
}

}
if(i1<0 || j1<0 || i1>n-1 || j1>n-1 || o==3)
{
    cout<<"Impossible";return 0;
}
 if(v.size()==0){cout<<v.size();return 0;}
cout<<v.size()<<"\n";
for(auto i:v)
{
    cout<<i<<" ";
}
return 0;
}