#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll,ll> P;
#define REP(i,n) for(ll i=0;i<ll(n);i++)














int main(void){
	cin.tie(nullptr);  ios_base::sync_with_stdio(false);
	ll i,j,k;




	ll N;
	string S;
	cin >> N >> S;



	ll c=0;
	REP(i,N){
		if(S[i]=='x'){
			if(c%2==0){
				c++;
			}
			else{
				continue;
			}
		}
		else{
			if(c%2==1){
				c++;
			}
			else{
				continue;
			}
		}

	}



	ll x=N-c;
	if(x%2==0){
		cout << "Yes" << endl;
		REP(i,N) cout << 'R';
		cout << endl;
	}
	else{
		if(N==1){
			cout << "No" << endl;
		}
		else{
			cout << "Yes" << endl;
			cout << 'L';
			REP(i,N-1) cout << 'R';
			cout << endl;

		}



	}







	return 0;

}