fn main() {
    let (r, w) = (std::io::stdin(), std::io::stdout());
    let mut sc = IO::new(r.lock(), w.lock());
    let n: usize = sc.read();
    let s = sc.chars();

    let mut ans = vec![0; n];

    ans[0] = 0;
    ans[1] = 0;
    create_ans(&mut ans, &s);
    if is_valid(&ans, &s) {
        for i in 0..n {
            if ans[i] == 0 {
                sc.write("S");
            } else {
                sc.write("W");
            }
        }
        sc.write("\n");
        return;
    }
    ans[0] = 0;
    ans[1] = 1;
    create_ans(&mut ans, &s);
    if is_valid(&ans, &s) {
        for i in 0..n {
            if ans[i] == 0 {
                sc.write("S");
            } else {
                sc.write("W");
            }
        }
        sc.write("\n");
        return;
    }
    ans[0] = 1;
    ans[1] = 0;
    create_ans(&mut ans, &s);
    if is_valid(&ans, &s) {
        for i in 0..n {
            if ans[i] == 0 {
                sc.write("S");
            } else {
                sc.write("W");
            }
        }
        sc.write("\n");
        return;
    }
    ans[0] = 1;
    ans[1] = 1;
    create_ans(&mut ans, &s);
    if is_valid(&ans, &s) {
        for i in 0..n {
            if ans[i] == 0 {
                sc.write("S");
            } else {
                sc.write("W");
            }
        }
        sc.write("\n");
        return;
    }
    sc.write("-1\n");
}

fn is_valid(ans: &Vec<usize>, s: &Vec<char>) -> bool {
    let n = ans.len();
    for i in 0..n {
        match (s[i], ans[i]) {
            ('o', 0) => {
                if ans[(i + 1) % n] != ans[(n + i - 1) % n] {
                    return false;
                }
            }
            ('x', 0) => {
                if ans[(i + 1) % n] != ans[(n + i - 1) % n] ^ 1 {
                    return false;
                }
            }
            ('o', 1) => {
                if ans[(i + 1) % n] != ans[(n + i - 1) % n] ^ 1 {
                    return false;
                }
            }
            ('x', 1) => {
                if ans[(i + 1) % n] != ans[(n + i - 1) % n] {
                    return false;
                }
            }
            _ => unreachable!(),
        }
    }
    true
}

fn create_ans(ans: &mut Vec<usize>, s: &Vec<char>) {
    let n = s.len();
    for i in 1..(n - 1) {
        match (s[i], ans[i]) {
            ('o', 0) => {
                ans[i + 1] = ans[i - 1];
            }
            ('x', 0) => {
                ans[i + 1] = ans[i - 1] ^ 1;
            }
            ('o', 1) => {
                ans[i + 1] = ans[i - 1] ^ 1;
            }
            ('x', 1) => {
                ans[i + 1] = ans[i - 1];
            }
            _ => unreachable!(),
        }
    }
}

pub struct IO<R, W: std::io::Write>(R, std::io::BufWriter<W>);

impl<R: std::io::Read, W: std::io::Write> IO<R, W> {
    pub fn new(r: R, w: W) -> IO<R, W> {
        IO(r, std::io::BufWriter::new(w))
    }
    pub fn write<S: std::ops::Deref<Target = str>>(&mut self, s: S) {
        use std::io::Write;
        self.1.write(s.as_bytes()).unwrap();
    }
    pub fn read<T: std::str::FromStr>(&mut self) -> T {
        use std::io::Read;
        let buf = self
            .0
            .by_ref()
            .bytes()
            .map(|b| b.unwrap())
            .skip_while(|&b| b == b' ' || b == b'\n' || b == b'\r' || b == b'\t')
            .take_while(|&b| b != b' ' && b != b'\n' && b != b'\r' && b != b'\t')
            .collect::<Vec<_>>();
        unsafe { std::str::from_utf8_unchecked(&buf) }
            .parse()
            .ok()
            .expect("Parse error.")
    }
    pub fn vec<T: std::str::FromStr>(&mut self, n: usize) -> Vec<T> {
        (0..n).map(|_| self.read()).collect()
    }
    pub fn chars(&mut self) -> Vec<char> {
        self.read::<String>().chars().collect()
    }
}


Measured memory_bytes: 4352