#include <bits/stdc++.h>
using namespace std;
#define ford(i,s,e) for(int i=s;i<e;i++)
#define tr(container,it) for(typeof(container.begin()) it = container.begin();it!=container.end();it++)
#define sz(a) int(a.size())
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define all(c) c.begin(),c.end()
#define rall(c) c.rbegin(),c.rend()
#define rall(c) c.rbegin(),c.rend()
#define vpresent(c,elt) (find(all(c),elt)!=c.end())
#define present(c,elt) (c.find(elt) != c.end())
#define optimize ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define debug(i) cout << "here at position " <<  i;
#define traceone(x) cout << x << endl;
#define tracetwo(x,y) cout << x << " " << y << endl;
#define tracethree(x,y,z) cout << x << " " << y << " " << z << endl;
#define tracefour(x,y,z,w) cout << x << " " << y << " " << z << " " << w << endl;
#define TT() cout << float(clock())/CLOCKS_PER_SEC
const int mod=1000000007;

typedef int64_t ll;

typedef pair<int,int> pii;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef vector<int> vi;
typedef vector<vector<ll> > vvi;
int difi,difj;
void LR()
{
    string s;
        if(difj<0)
                s="R";
            else
                s="L";
        ford(i,0,abs(difj)/2)
            cout << s << " ";

}


int main() {
    int n;cin >> n;
    int is,js,ie,je;
    cin >> is >> js >> ie >> je;
    difi=is-ie;
    difj=js-je;
    //tracetwo(difi,difj);
    if(difi%2!=0)
    {
        cout << "Impossible" << endl;
        return 0;
    }
    if((abs(difj)-abs(difi)/2)%2!=0)
    {
        cout << "Impossible" << endl;
        return 0;
    }
    string s;int tmp;
    if(difj==0)
    {
        if(difi>0)
            s="UL";
        else
            s="LR";
        tmp=abs(difi);
        int total=(3*tmp)/4;
        cout << total << endl;
        while(tmp)
        {
            cout << s << " ";
            tmp-=2;
        }
        difj=difi/2;
        LR();
        return 0;
    }
    if(difi>0)
    {
        if(difj>0)
            s="UL";
        else
            s="UR";
    }
    else
    {
        if(difj>0)
            s="LL";
        else
            s="LR";
    }
    tmp=abs(difi);
    difj=abs(difj)-abs(difi)/2;
    cout << tmp/2 + (abs(difj))/2 << endl;
    while(tmp)
    {
        cout << s << " ";
        tmp-=2;
    }
    LR();
}