#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
    int UL=0,UR=0,LL=0,LR=0,L=0,R=0;
    void fun(){
        while(UL--){
            cout<<"UL ";
        }
        while(UR--){
            cout<<"UR ";
        }
        while(R--){
            cout<<"R ";
        }
        while(LR--){
            cout<<"LR ";
        }
        while(LL--){
            cout<<"LL ";
        }
        while(L--){
            cout<<"L ";
        }
        
    }

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    int x,y,xx,yy;
    cin>>x>>y>>xx>>yy;
    if(abs(x-xx)%2){
        cout<<"Impossible";
    }else {
        if(x > xx  && y > yy){
            int diffStep = abs(x-xx)/2;
            int diffCount  = abs(y-yy);
            if(diffCount == diffStep) {
                UL += diffStep;
            }else if(diffCount<diffStep){
                UL += diffCount ;
                diffStep -= diffCount;
                if(diffStep%2 == 0){
                    UL+=diffStep/2;
                    UR+=diffStep/2;
                }else{
                    UL+=diffStep;
                    R+=1;
                }
            }else if(diffCount>diffStep){
                UL += diffStep;
                L+=1;
            }
                        cout<<(LL+L+LR+UL+UR+R)<<endl;
            fun();

        }
        else if(x > xx  && y < yy){
            int diffStep = abs(x-xx)/2;
            int diffCount  = abs(y-yy);
            if(diffCount == diffStep) {
                UR += diffStep;
            }else if(diffCount<diffStep){
                UR += diffCount ;
                diffStep -= diffCount;
                if(diffStep%2 == 0){
                    UL+=diffStep/2;
                    UR+=diffStep/2;
                }else{
                    UL+=diffStep;
                    R+=1;
                }
            }else if(diffCount>diffStep){
                UL += diffStep;
                L+=1;
            }
                        cout<<(LL+L+LR+UL+UR+R)<<endl;
            fun();

        }
        else if (x < xx && y < yy){
            int diffStep = abs(x-xx)/2;
            int diffCount  = abs(y-yy);
            if(diffCount == diffStep) {
                LR += diffStep;
            }else if(diffCount<diffStep){
                LR += diffCount ;
                diffStep -= diffCount;
                if(diffStep%2 == 0){
                    LR+=diffStep/2;
                    LL+=diffStep/2;
                }else{
                    LR+=diffStep;
                    L+=1;
                }
            }else if(diffCount>diffStep){
                LR += diffStep;
                R+=1;
            }
                        cout<<(LL+L+LR+UL+UR+R)<<endl;
            fun();

        }
        else if (x < xx && y > yy){
            int diffStep = abs(x-xx)/2;
            int diffCount  = abs(y-yy);
            if(diffCount == diffStep) {
                LL += diffStep;
            }else if(diffCount<diffStep){
                LL += diffCount ;
                diffStep -= diffCount;
                if(diffStep%2 == 0){
                    LR+=diffStep/2;
                    LL+=diffStep/2;
                }else{
                    LR+=diffStep;
                    L+=1;
                }
            }else if(diffCount>diffStep){
                LR += diffStep;
                R+=1;
            }
            cout<<(LL+L+LR+UL+UR+R)<<endl;
            fun();
        }
        else if(x == xx){
            
        }
        else if(y==yy){
            if(y<yy)
                cout<<1<<endl<<"R";
            if(y>yy)
                cout<<1<<endl<<"L";
        }
    }
    return 0;
}