#include <bits/stdc++.h>

using namespace std;
int n;

int abs(int x){
    if(x<0)
        x*=-1;
    
   // cout<<"x="<<x<<endl;
    return x;
}
bool func(int is,int js,int ie,int je){
    int ansi=0; int ansj=0;
    if(is%2==0 && ie%2==0){
        ansi=1;
    }
    if(is%2==1 && ie%2==1){
        ansi=1;
    }
    if(abs(ie-is)%4==0){
        if(js%2==0&&je%2==0){
            ansj=1;
        }
        if(js%2==1&&je%2==1){
            ansj=1;
        }
        
    }
    else{
        if(js%2==0&&je%2==1){
            ansj=1;
        }
        if(js%2==1&&je%2==0){
            ansj=1;
        }
    }
    
    if(ansi==1 && ansj==1)
        return true;
        else 
            return false;
    
        
}


 void printfun(int is,int js, int ie,int je,int * count,string arr[] ){
 
    int ul,ur,r,lr,ll,l;
    ul=ur=r=lr=ll=l=0;
    int up,ni,da,ja;
    up=ni=da=ja=0;
    if((is-ie)>0){
        up=1;      
      }
    if((is-ie)<0) 
        ni=1;
     if((js-je)>0){
         da=1;
     }
    if((js-je)<0)
        ja=1;
    
    if(up==1 && da==1)
    {
    	
       arr[*count]="UL";
       
        is=is-2;js=js-1;
        *count=*count+1;
        
        //cout<<arr[*count];
	//	cout<<"UL"<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
       printfun(is,js,ie,je,count,arr);
        
    }
   else if(up==1 && ja==1)
    {
       arr[*count]="UR";
        is=is-2;js=js+1;
        *count=*count+1;
     //   cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
       printfun(is,js,ie,je,count,arr);
        
    }
    else if(up==1 )
    {
    	if((js-1)>=0){
		
       arr[*count]="UL";
        is=is-2;js=js-1;
        *count=*count+1;
      //  cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
       printfun(is,js,ie,je,count,arr);
	   }
	   else{
	   	 arr[*count]="UR";
        is=is-2;js=js+1;
        *count=*count+1;
      //  cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
       printfun(is,js,ie,je,count,arr);
	   	
	   }
        
    }
    else if(up==0 && ni==0&& ja==1)
    {
        arr[*count]="R";
        *count=*count+1;
        js=js+2;
        cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
        printfun(is,js,ie,je,count,arr);
    }
    else if(ni==1 && ja==1)
    {
       arr[*count]="LR";
        is=is+2;js=js+1;
        *count=*count+1;
     //   cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
        printfun(is,js,ie,je,count,arr);
        
    }
   else if(ni==1 && da==1)
    {
       arr[*count]="LL";
        is=is+2;js=js-1;
        *count=*count+1;
      //  cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
        printfun(is,js,ie,je,count,arr);
        
    }
    else if(ni==1){
    	if((js+1)<=n-1){
		arr[*count]="LR";
    	is=is+2;js=js+1;
    	*count=*count+1;
    //	cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
        printfun(is,js,ie,je,count,arr);
		}
		else{
		arr[*count]="LL";
    	is=is+2;js=js-1;
    	*count=*count+1;
    //	cout<<arr[*count]<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
        printfun(is,js,ie,je,count,arr);

		}
	}
    else if(up==0 && ni==0&& da==1)
    {
        arr[*count]="L";
        *count=*count+1;
        js=js-2;
        //cout<<arr[*count];
	//	cout<<"L"<<"is="<<is<<"js="<<js<<"count="<<*count<<endl;
        printfun(is,js,ie,je,count,arr);
    }
    else {
	}
   
    
    
}

int main() {
    
    cin >> n;
    int is,js,ie,je;
    cin>>is>>js>>ie>>je;
    int count=0;
    string arr[1000];
    bool ans=func(is,js,ie,je);
    if(ans==true)
    { 
   //     cout<<"possible"<<endl;
        printfun(is,js,ie,je,&count,arr);
        cout<<count<<endl;
        for(int i=0;i<count;i++){
            cout<<arr[i]<<" ";
        }
     
    }
    else cout<<"Impossible";
    
    return 0;
}