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

using VI = vector<int>;
using VVI = vector<VI>;
using PII = pair<int, int>;
using LL = long long;
using VL = vector<LL>;
using VVL = vector<VL>;
using PLL = pair<LL, LL>;
using VS = vector<string>;

#define ALL(a)  begin((a)),end((a))
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define EB emplace_back
#define MP make_pair
#define SZ(a) int((a).size())
#define SORT(c) sort(ALL((c)))
#define RSORT(c) sort(RALL((c)))
#define UNIQ(c) (c).erase(unique(ALL((c))), end((c)))

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

#define FF first
#define SS second
template<class S, class T>
istream& operator>>(istream& is, pair<S,T>& p){
  return is >> p.FF >> p.SS;
}
template<class S, class T>
ostream& operator<<(ostream& os, const pair<S,T>& p){
  return os << p.FF << " " << p.SS;
}
template<class T>
void maxi(T& x, T y){
  if(x < y) x = y;
}
template<class T>
void mini(T& x, T y){
  if(x > y) x = y;
}


const double EPS = 1e-10;
const double PI  = acos(-1.0);
const LL MOD = 1e9+7;

int main(){
  cin.tie(0);
  ios_base::sync_with_stdio(false);

  int N;
  cin >> N;
  int sy, sx, ey, ex;
  cin >> sy >> sx >> ey >> ex;

  vector<string> ans;
  while(ey <= sy-2 && sy-2 >= 0){
	sy -= 2;
	if(sx == N-1 || (ex <= sx && sx-1 >= 0)){
	  ans.EB("UL");
	  --sx;
	}
	else{
	  ans.EB("UR");
	  ++sx;
	}
  }
  while(sy+2 <= ey && sy+2 < N){
	sy += 2;
	if(sx == 0 || (sx <= ex && sx+1 < N)){
	  ans.EB("LR");
	  ++sx;
	}
	else{
	  ans.EB("LL");
	  --sx;
	}
  }

  if(sy != ey){
	cout << "Impossible" << endl;
	return 0;
  }

  while(ex <= sx-2 && sx-2 >= 0){
	ans.EB("L");
	sx -= 2;
  }
  while(sx+2 <= ex && sx+2 < N){
	ans.EB("R");
	sx += 2;
  }

  if(sx == ex && sy == ey){
	cout << SZ(ans) << endl;
	map<string,int> ix;
	ix["UL"] = 0;
	ix["UR"] = 1;
	ix["R"] = 2;
	ix["LR"] = 3;
	ix["LL"] = 4;
	ix["L"] = 5;
	sort(ALL(ans), [&ix](const string& l, const string& r){
		return ix[l] < ix[r];
	  });
	REP(i,SZ(ans)){
	  cout << (i?" ":"") << ans[i];
	}
	cout << endl;
  }
  else{
	cout << "Impossible" << endl;
  }

  return 0;
}