//aneesh bose
#include <bits/stdc++.h>
using namespace std;
const int N=1234567;
int a[N]; bool visited[N];

#define loop(i,n) for(int i=0;i<n;i++)
#define loope(i,n) for(int i=0;i<=n;i++)
#define loope(i,l,r) for(int i=l;i<=r;i++)
#define loopr(i,n) for(int i=n-1;i>=0;i--)

#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define yolo "debug_statement"

typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef vector<pii> vpii;
typedef vector<int> vi;

const ll inf = 1e9;
const ld eps = 1e-9;
const ld pi=acos(-1);
const ll mod=1000000007;

ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}

/*void dfs(int source){
    visited[source] = true;
    for(auto it: adj[source])
        if(!visited[it])
            dfs(it);
}*/

int main(){
    ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL);
    int mn=0;
    int n;
    cin>>n;
    int sr,sc,dr,dc;
    cin>>sr>>sc>>dr>>dc;
    string ans="";
    int ogr,ogc;
    ogr=sr;ogc=sc;

    bool done=false; int moves=0;

    //cout<<sr<<" "<<sc<<endl;

    while(sr>dr && sc>dc)
    {
        if(sr-2>=dr && sc-1>=dc)
        {
            ans+="UL ";
            //cout<<sr<<" "<<sc<<endl;
            sr-=2; sc-=1;
            ogr-=2; ogc-=1;
            moves++;
        }
        if(sr-2<0 || sr-2<dr || sc-1<0)
            break;
    }
    //cout<<"Hello\n";

    //cout<<sr<<" "<<sc<<endl;
    while(sr>dr && sc<dc)
    {
        if(sr-2>=dr && sc+1<=dc)
        {
            ans+="UR ";
            sr-=2; sc+=1;
            ogr-=2; ogc+=1;
            moves++;
        }
        if(sr-2<0 || sc+1>=n)
            break;
    }

    //cout<<sr<<" "<<sc<<endl;
    while(sc<dc && sr<dr)
    {
        if(sc+1<=dc && sr+2<=dr)
        {
            ans+="LR ";
            sc+=1; sr+=2;
            ogc+=1;ogr+=2;
            //cout<<sr<<" "<<sc<<endl;
            moves++;
        }
        if(sr+2>=n || sc+1>=n || sr+2>dr)
            break;
    }

    //cout<<sr<<" "<<sc<<endl;
    while(sc>dc && sr<dr)
    {
        if(sc-1>=dc && sr+2<=dr)
        {
            ans+="LL ";
            sc-=1; sr+=2;
            ogc-=1;ogr+=2;
            moves++;
        }
        if(sr+2>=n || sr+2>dr || sc-1<0)
            break;
    }

    //cout<<sr<<" "<<sc<<endl;
    while(sc<dc)
    {
        if(sc+2<=dc)
        {
            ans+="R ";
            sc+=2;
            moves++;
        }
        else
            break;
    }

    //cout<<sr<<" "<<sc<<endl;
    while(sc>dc)
    {
        if(sc-2>=dc)
        {
            ans+="L ";
            sc-=2;
            moves++;
        }
        else
            break;
    }
    if(sr==dr && sc==dc)
        done=true;
    if(ogc==dc && abs(ogr-dr)%4==0 && dr>sr)
    {
        cout<<moves+abs(ogr-dr)/2<<endl;
        cout<<ans;
        for(int i=1;i<=abs(ogr-dr)/4;i++)
            cout<<"LR ";
        for(int i=1;i<=abs(ogr-dr)/4;i++)
            cout<<"LL ";

        return 0;
    }
    if(ogc==dc && abs(ogr-dr)%4==0 && dr<sr)
    {
        cout<<moves+abs(ogr-dr)/2<<endl;
        cout<<ans;
        for(int i=1;i<=abs(ogr-dr)/4;i++)
            cout<<"UL ";
        for(int i=1;i<=abs(ogr-dr)/4;i++)
            cout<<"UR ";

        return 0;
    }
    if(done)
        cout<<moves<<endl<<ans;
    else
        cout<<"Impossible";

    //cout<<sr<<" "<<sc<<endl;
	return 0;
}