#include<bits/stdc++.h>
#define mp make_pair
using namespace std;

int n;

int main(){
		cin>>n;
		int is,ie,js,je;
		int ans=0;
		cin>>is>>js>>ie>>je;
		int ase=0;
		int di=abs(is-ie);
		int dj=abs(js-je);
		string s="";
		if((di%4==0 && dj%2==0)||(di%4!=0 && di%2==0 && (dj-1)%2==0)){
		if(is>=ie && js>=je){
				ase=0;      //UL
		}
		else if(is>=ie && js<=je){
				ase=1;      //upperright
		}
		else if(is<=ie && js>=je){
			ase=2;                  //LL
		}
		else if(is<=ie && js<=je){
			ase=3;                  //LR
		}
//cout<<ase<<"\n";
		if(ase==0){
                while(1){
			while(is-2>=ie && js-1>=je){
				ans++;
				s=s+"UL ";
				is=is-2;	js=js-1;
				//cout<<is<<"  "<<js<<"\n";
			}
			while(js-2>=je){
				ans++;
				s=s+"L ";
				js=js-2;    //cout<<is<<"  "<<js<<"\n";
			}
			if(je==js && is>ie && abs(is-ie)%4==0){
                    int kk=abs(is-ie)/4;
                    while(kk--){
                            is=is-4;
                            ans+=2;
                        s=s+"UL UR ";
                    }
			}
			if(ie==is && je==js)
                break;
                }
		}
		if(ase==3){
                while(1){
			while(is+2<=ie && js+1<=je){
				s=s+"LR ";	ans++;
				is=is+2;	js=js+1;
			}
			while(js+2<=je){
				s=s+"R ";	ans++;
				js=js+2;
			}
			if(je==js && is<ie && abs(is-ie)%4==0){
                    int kk=abs(is-ie)/4;
                    while(kk--){
                            ans+=2;
                            is=is+4;
                        s=s+"LR LL ";
                    }
			}
			if(ie==is && je==js)
                break;
                }
		}
    if(ase==1){
        while(1){
			while(is-2>=ie && js+1<=je){
				s=s+"UR ";	ans++;
				is=is-2;	js=js+1;
			}
			while(js+2<=je){
				s=s+"R ";	ans++;
				js=js+2;

			}
			if(je==js && is>ie && abs(is-ie)%4==0){
                    int kk=abs(is-ie)/4;
                    while(kk--){
                            ans+=2;
                            is=is-4;
                        s=s+"UL UR ";
                    }
			}
			//cout<<is<<"  "<<js<<"\n";
			if(ie==is && je==js)
                break;
                }
		}
		if(ase==2){	//LL L
                while(1){
			while(is+2<=ie && js-1>=je){
				s=s+"LL ";	ans++;
				is=is+2;	js=js-1;
			}
			while(js-2>=je){
				s=s+"L ";	ans++;
				js=js-2;
			}
			if(je==js && is<ie && abs(is-ie)%4==0){
                    int kk=abs(is-ie)/4;
                    while(kk--){
                            is=is+4;
                            ans+=2;
                        s=s+"LR LL ";
                    }
			}
			if(ie==is && je==js)
                break;
                }
		}
		cout<<ans<<"\n"<<s;
	}
else{
	cout<<"Impossible";
}
	return 0;
}