/* dsingh_24 */
 
#include<bits/stdc++.h>
#define ll          long long 
#define pb          push_back
#define endl        '\n'
#define pii         pair<ll ,ll>
#define vll          vector<ll>
#define all(a)      (a).begin(),(a).end()
#define F           first
#define S           second
#define sz(x)       (ll int)x.size()
#define hell        1000000000
#define rep(i,a,b)  for(ll int i=a;i<b;i++)
#define lbnd        lower_bound
#define ubnd        upper_bound
#define bs          binary_search
#define mp          make_pair
#define ios         ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
#define N  100005

int main()
{
    ios
    ll n,i,j,ul=0,ur=0,l=0,r=0,dr=0,dl=0;
    cin>>n;
    ll x1,x2,y1,y2;
    cin>>x1>>y1>>x2>>y2;
    if(abs(x1-x2)%2!=0||abs(abs(y1-y2)-abs(x1-x2)/2)%2!=0)
        cout<<"Impossible\n";else
    {
        if(x1>=x2)
        {
            if(y1>=y2)
            {
                ll t=y1-y2,xx=x1-x2;xx/=2;
                if(t>=xx)
                {
                    l=(t-xx)/2;
                    ul=xx;
                    cout<<l+ul<<"\n";
                    while(l--)cout<<"L ";
                    while(ul--)cout<<"UL ";
                }else
                {
                    ur=(xx-t)/2;
                    ul=xx-ur;
                    cout<<xx<<"\n";
                    while(ur--)cout<<"UR ";
                    while(ul--)cout<<"UL ";
                }
            }else
            {
                ll t=y2-y1,xx=x1-x2;xx/=2;
                if(t>=xx)
                {
                    r=(t-xx)/2;
                    ur=xx;
                    cout<<r+ur<<"\n";
                    while(r--)cout<<"R ";
                    while(ur--)cout<<"UR ";
                }else
                {
                    ul=(xx-t)/2;
                    ur=xx-ul;
                    cout<<xx<<"\n";
                    while(ur--)cout<<"UR ";
                    while(ul--)cout<<"UL ";
                }
            }
        }else
        {
            if(y1>=y2)
            {
                ll t=y1-y2,xx=x2-x1;xx/=2;
                if(t>=xx)
                {
                    l=(t-xx)/2;
                    ul=xx;
                    cout<<l+ul<<"\n";
                    while(l--)cout<<"L ";
                    while(ul--)cout<<"LL ";
                }else
                {
                    ur=(xx-t)/2;
                    ul=xx-ur;
                    cout<<xx<<"\n";
                    while(ur--)cout<<"LR ";
                    while(ul--)cout<<"LL ";
                }
            }else
            {
                ll t=y2-y1,xx=x2-x1;xx/=2;
                if(t>=xx)
                {
                    r=(t-xx)/2;
                    ur=xx;
                    cout<<r+ur<<"\n";
                    while(r--)cout<<"R ";
                    while(ur--)cout<<"LR ";
                }else
                {
                    ul=(xx-t)/2;
                    ur=xx-ul;
                    cout<<xx<<"\n";
                    while(ur--)cout<<"LR ";
                    while(ul--)cout<<"LL ";
                }
            }
        }
    }
    return 0;
}