#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>
void dbg(const vector<T>& v) {
    cerr << "[";
    for (size_t i = 0; i < v.size(); ++i) {
        if (i) cerr << ", ";
        cerr << v[i];
    }
    cerr << "]\n";
}
#define show(x) cerr << #x " = " << (x) << '\n'

void YesNo(bool d) {
    if (d) cout << "Yes" << '\n';
    else cout << "No" << '\n';
}

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

    int n;
    string s;
    cin >> n >> s;
    string rans,lans,ans;
    bool d = 0, r = 1;
    bool last = 0;
    for (int i = 1; i < n; i++) {
        if ((s[i-1] == s[i] && !last) || (s[i-1] != s[i] && last)){
            rans.push_back('L');
            last = 1;
        }
        else {
            r = r^1;
            rans.push_back('R');
            last = 0;
        }
    }

    if (r == 1 && last == 1) {
        r = 0;
        last = 0;
    }
    if ((!(r+last) && s[n-1]=='o')||((r+last) && s[n-1]=='x')) {
        d ^= 1;
        ans.push_back('R');
        ans = ans + rans;
        goto next;
    }
    
    r = 0, last = 1;
    for (int i = 1; i < n; i++) {
        if ((s[i-1] == s[i] && !last) || (s[i-1] != s[i] && last)){
            lans.push_back('L');
            last = 1;
        }
        else {
            r = r^1;
            lans.push_back('R');
            last = 0;
        }
    }
    if (r == 1 && last == 1) {
        r = 0;
        last = 0;
    }
    if ((!(r+last) && s[n-1]=='o')||((r+last) && s[n-1]=='x')) {
        d ^= 1;
        ans.push_back('L');
        ans = ans + lans;
    }
next:
    YesNo(d);
    if (d) 
        cout << ans <<'\n';
}
// このテンプレートは https://yukicoder.me/users/24957/ai_code/11 で公開しています