using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Globalization;
using System.Diagnostics;
using static System.Console;
using Pair = System.Collections.Generic.KeyValuePair<int, int>;

class Program
{
    static void Main()
    {
        SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false });
        new Program().Solve();
        Out.Flush();
    }
    Scanner cin = new Scanner();
    readonly int[] dd = { 0, 1, 0, -1, 0 };
    readonly int mod = 1000000007;
    readonly string alfa = "abcdefghijklmnopqrstuvwxyz";

    int N;
    string S;
    bool[] A;
    void Solve()
    {
        N = cin.Nextint;
        S = cin.Next;
        bool flag = false;
        if (Check(true, true) || Check(true, false) || Check(false, true) || Check(false, false))
        {
            flag = true;
        }
        if (flag)
        {
            for (int i = 0; i < N; i++)
            {
                if (A[i])
                {
                    Write('S');
                }
                else
                {
                    Write('W');
                }
            }
            WriteLine();
        }
        else
        {
            WriteLine(-1);
        }


    }
    bool Check(bool zero, bool one)
    {
        bool J = true;
        A = new bool[N];
        A[0] = zero; A[1] = one;
        for (int i = 1; i < N - 1; i++)
        {
            int r = i + 1;
            int l = i - 1;
            if (A[i] == true)
            {
                if (S[i] == 'o')
                {
                    A[r] = A[l];
                }
                else
                {
                    A[r] = !A[l];
                }
            }
            else
            {
                if (S[i] == 'o')
                {
                    A[r] = !A[l];
                }
                else
                {
                    A[r] = A[l];
                }
            }

        }
        
        for (int i = 0; i < N; i++)
        {
            int r = (i + 1) % N;
            int l = i - 1;
            if (i == 0) l = N - 1;
            if (A[i] ==true)
            {
                if (S[i] == 'o')
                {
                    if (A[l] != A[r])
                    {
                        J = false;
                    }
                }
                else 
                {
                    if (A[l] == A[r])
                    {
                        J = false;
                    }
                }
            }
            else
            {
                if (S[i] == 'o')
                {
                    if (A[l] == A[r])
                    {
                        J = false;
                    }
                }
                else
                {
                    if (A[l] != A[r])
                    {
                        J = false;
                    }
                }
            }
            if (J == false) break;
        }
        return J;




    }

}

class Scanner
{
    string[] s; int i;
    char[] cs = new char[] { ' ' };
    public Scanner() { s = new string[0]; i = 0; }
    public string[] Scan { get { return ReadLine().Split(); } }
    public int[] Scanint { get { return Array.ConvertAll(Scan, int.Parse); } }
    public long[] Scanlong { get { return Array.ConvertAll(Scan, long.Parse); } }
    public double[] Scandouble { get { return Array.ConvertAll(Scan, double.Parse); } }
    public string Next
    {
        get
        {
            if (i < s.Length) return s[i++];
            string st = ReadLine();
            while (st == "") st = ReadLine();
            s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries);
            i = 0;
            return Next;
        }
    }
    public int Nextint { get { return int.Parse(Next); } }
    public long Nextlong { get { return long.Parse(Next); } }
    public double Nextdouble { get { return double.Parse(Next); } }
}

Measured memory_bytes: 13228