use itertools::Itertools;
use proconio::{input, marker::Bytes};

fn main() {
    input! {
        n: usize,
        s: Bytes,
    }

    if n == 1 && s[0] == b'o' {
        println!("No");
        return;
    }

    for t in 0..2 {
        let mut d = s.windows(2).map(|w| w[0] == w[1]).collect_vec();
        d.push(false);
        if t == 1 {
            d[0] ^= true;
        }
        let mut ans = String::from(if t == 0 { "L" } else { "R" });
        let mut ok = s[0] == b'x';
        for i in 0..n - 1 {
            if d[i] {
                ans.push('R');
                d[i + 1] ^= true;
            } else {
                ans.push('L');
                ok ^= true;
            }
        }

        if ok {
            println!("Yes");
            println!("{ans}");
            return;
        }
    }

    println!("No");
}