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

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

    int N; cin >> N;
    string s; cin >> s;

    {
        string t = "";
        t += 'L';
        for(int i=1; i<N; i++){
            if(s.at(i) == s.at(i-1)) t += t.back()^'L'^'R';
            else t += t.back();
        } 
        int l = 0,r = 0;
        string S = "";
        for(auto c : t) r += c=='L';
        int pos = 0;
        for(auto c : t){
            if(c == 'R') l++;
            if((r+l)%2) S += s.at(pos)^'o'^'x';
            else S += s.at(pos);
            pos++;
            if(c == 'L') r--;
        }
        bool ok = true;
        for(auto c : S) if(c == 'x') ok = false;
        if(ok){cout << "Yes\n" << t << "\n"; return 0;}
    }
    {
        string t = "";
        t += 'R';
        for(int i=1; i<N; i++){
            if(s.at(i) == s.at(i-1)) t += t.back()^'L'^'R';
            else t += t.back();
        } 
        int l = 0,r = 0;
        string S = "";
        for(auto c : t) r += c=='L';
        int pos = 0;
        for(auto c : t){
            if(c == 'R') l++;
            if((r+l)%2) S += s.at(pos)^'o'^'x';
            else S += s.at(pos);
            pos++;
            if(c == 'L') r--;
        }
        bool ok = true;
        for(auto c : S) if(c == 'x') ok = false;
        if(ok){cout << "Yes\n" << t << "\n"; return 0;}
    }
    cout << "No\n";
}