#include <bits/stdc++.h>
using namespace std;
#define pb push_back
int main()
{
    vector<string>v;
    int n,x1,y1,x2,y2;
    cin>>n;
    cin>>x1>>y1>>x2>>y2;
    if(y1>y2&&x1>x2)
    {
        int diff=y2-y1;
        if((x1-x2)%2==1)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            while(x2!=x1)
            {
                y1--;
                //y2-=2;
                //x2++;
                x1-=2;
                v.pb("UL");
            }
            if((y1-y2)%2)
            {
                cout<<"Impossible"<<endl;
            }
            else
            {
                while(y2!=y1)
                {
                    //x2+=2
                    y1-=2;
                    v.pb("L");
                }
                cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
            }
        }
    }
    else if(y1<y2&&x1>x2)
    {
        int diff=y2-y1;
        if((x1-x2)%2==1)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            while(x2!=x1)
            {
                x1-=2;
                y1++;
               // y1+=2;
                //y2-=2;
                //x1++;
                v.pb("UR");
            }
            if((y2-y1)%2)
            {
                cout<<"Impossible"<<endl;
            }
            else
            {
                while(y1!=y2)
                {
                    y1+=2;
                   // x1+=2;
                    //x2-=2;
                    v.pb("R");
                }
                cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
            }
        }
    }
    else if(y2>y1&&x2>x1)
    {
        if((x2-x1)%2==1)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            while(x2!=x1)
            {
                x1+=2;
                y1++;
                //y2-=2;
                //x1--;
                v.pb("LR");
            }
            if((y2-y1)%2)
            {
                cout<<"Impossible"<<endl;
            }
            else
            {
                while(y1!=y2)
                {
                    y1+=2;
                    //x2-=2;
                    v.pb("R");
                }
                cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
            }
        }
    }
    else if(x2>x1&&y1>y2)
    {
        if((x2-x1)%2==1)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            while(x2!=x1)
            {
                x1+=2;
                //y2-=2;
                y1--;
                //x1++;
                v.pb("LL");
            }
            if((y1-y2)%2)
            {
                cout<<"Impossible"<<endl;
            }
            else
            {
                while(y1!=y2)
                {
                    y1-=2;
                    //x1+=2;
                    //x2-=2;
                    v.pb("L");
                }
                cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
            }
        }
    }
    else if(x1>x2&&y1==y2)
    {
        if(x1-x2==2||x1-x2%2)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            int u=0;
            while(u<(x1-x2)/4)
            {
                v.pb("UL");
                u++;
            }
            while(u<(x1-x2)/2)
            {
                v.pb("UR");
                u++;
            }
            cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
        }
    }
    else if(x1<x2&&y1==y2)
    {
        if(x2-x1==2)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            int u=0;
            while(u<(x2-x1)/4)
            {
                v.pb("LR");
                u++;
            }
            while(u<(x2-x1)/2)
            {
                v.pb("LL");
                u++;
            }
            cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
        }
    }
    else if(x1==x2&&y2>y1)
    {
        if((y2-y1)%2)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            int u=0;
            while(u<(y2-y1)/2)
            {
                v.pb("R");
                u++;
            }
            cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
        }
    }
    else if(x1==x2&&y1>y2)
    {
         if((y1-y2)%2)
        {
            cout<<"Impossible"<<endl;
        }
        else
        {
            int u=0;
            while(u<(y1-y2)/2)
            {
                v.pb("L");
                u++;
            }
            cout<<v.size()<<endl;
                for(int i=0;i<v.size();i++)
                    cout<<v[i]<<" ";
                cout<<endl;
        }
    }

    return 0;
}