#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define el "\n" 
#define fio ios_base::sync_with_stdio(false),cin.tie(NULL)
#define ull unsigned long long int
#define ld long double
#define F first  
#define S second 
#define PB push_back 
#define MP make_pair
#define LB lower_bound//pass (a,a+n,key)
#define UB upper_bound
#define vi vector<int>  
#define pi pair<int,int> 
//rotate array d times using--> rotate(a,a+d,a+n);
//reverse array of d elements using--> reverse(a,a+d);
const long double PI = atan(1.0)*4.0;
const ll M = 1000000007;
const ll INF = 1e18;
const ll E=1e-9;
 
bool isprime(ll n)
{
    for(ll i=2;i*i<=n;i++)
    {
        if(n%i==0)
            return false;
    }
    return true;
}
bool iseql(ld n,ld m)
{
      if(abs(n-m)<E)
            return true;
        else
            return true;
}
 
ll fact(ll n)
{
    ll fact = 1;
    for (int i=1;i<=n;i++)
        fact = ((fact)%M*i)%M;
    return fact;
} 
void divsr(int n)
{
    for (int i=1; i<=sqrt(n); i++)
    {
           if (n%i==0)
            {
               if (n/i == i)
                 cout<<i<<" ";
                  
               else
               cout<<i<<" "<<n/i<<" ";
                  
            }
     }
}
 
int main()
{
 fio;
 int n;
 cin>>n;
 int p[n]={0};
 int a,b,c,d,i;
   cin>>a>>b>>c>>d;
   if(abs(b-d)%2==0 && abs(b-d)!=0)
     cout<<"Impossible";
   else if( b==d && abs(a-c)%2==1)
     cout<<"Impossible";
   else if(b==d &&  a>c)
    {
       cout<<(a-c)/2<<el;
       while (b!=d || a!=c)
       {
           if(a>c && b==d)
           {
               a=a-2;
               b--;
               cout<<"UL"<<" ";
           }
           if(b<d)
           {
               b++;
               a=a-2;
               cout<<"UR"<<" ";
           }
       }
   } 
   else if((b==d) &&  (a<c))
       {
        cout<<(c-a)/2<<el;
        // cout<<"ppm"<<el;
       while ((b!=d) || (a!=c))
       {
        //   cout<<"ppm"<<el;
           if((a<c) && (b==d))
           {
               a=a+2;
               b++;
               cout<<"LR"<<" ";
           }
           if(b>d)
           {
               b--;
               a=a+2;
               cout<<"LL"<<" ";
           }
         //  cout<<a<<" "<<b<<" "<<c<<" "<<d<<el;
       }
   }  
    else if(c<a && b!=d)
    {
      i=0;
       while (b!=d || a!=c)
       {
           if(a>c && d<b)
           {
               a=a-2;
               b--;
               p[i]=1;
               i++;
           }
           else if(a>c && d>b)
           {
               b++;
               a=a-2;
               p[i]=2;
               i++;
           }
          else if(a==c && b>d)
           {
               b=b-2;
               p[i]=6;
               i++;
           }
           else if(a==c && b<d)
           {
               b=b+2;
               p[i]=3;
               i++;
           }
       }
        cout<<i<<el;
        for(int j=0;j<i;j++)
        {
            if(p[j]==1)
                cout<<"UL"<<" ";
            else if(p[j]==2)
                cout<<"UR"<<" ";
            else if(p[j]==3)
                cout<<"R"<<" ";
            else if(p[j]==6)
                cout<<"L"<<" ";
        }
   } 
}