#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define dump(...)
#endif
#define endl "\n"
#define ll long long
#define FOR(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define REP(i, x) for (int i = 0; i < (int)(x); i++)
#define REPS(i, x) for (int i = 1; i <= (int)(x); i++)
#define RREP(i, x) for (int i = ((int)(x)-1); i >= 0; i--)
#define RREPS(i, x) for (int i = ((int)(x)); i > 0; i--)
#define INF 2147483647
#define LLINF 9223372036854775807LL
#define vi vector<int>
#define vvi vector<vector<int>>
#define pi pair<int, int>
#define ALL(a) (a).begin(), (a).end()
#define BIT(n) (1LL << (n))
#define TOUPPER(s) transform(s.begin(), s.end(), s.begin(), ::toupper)
#define TOLOWER(s) transform(s.begin(), s.end(), s.begin(), ::tolower)
#define FILLZERO(s, n)                      \
    do {                                    \
        ostringstream os;                   \
        os << setw(n) << setfill('0') << s; \
        s = os.str();                       \
    } while (0);
#define UNIQUE(v) v.erase(unique(v.begin(), v.end()), v.end()) //sortしてからつかうこと
#define INIT                               \
    std::cin.tie(nullptr);                 \
    std::ios_base::sync_with_stdio(false); \
    cout << std::fixed << std::setprecision(10);

constexpr ll MOD = 1e9 + 7;
int dx[8] = {1, 0, -1, 0, 1, 1, -1, -1};
int dy[8] = {0, 1, 0, -1, 1, -1, 1, -1};
ll A, B, C, D, E, F, G, H, N, M, L, K, P, Q, R, W, X, Y, Z;
string S, T;
ll ans = 0;

template <typename T>
istream &operator>>(istream &is, vector<T> &vec) {
    for (T &x : vec)
        is >> x;
    return is;
}
template <class T>
inline bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return 1;
    }
    return 0;
}
template <class T>
inline bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return 1;
    }
    return 0;
}

signed main() {
    INIT;
    cin >> N;
    cin >> S;
    REP(n, 4) {
        vi v(N);
        v[0] = (n & 1);
        v[1] = ((n >> 1) & 1);
        REP(i, N - 2) {
            if (v[i + 1]) {
                if (S[i + 1] == 'o') {
                    v[i + 2] = v[i];
                } else {
                    v[i + 2] = !v[i];
                }
            } else {
                if (S[i + 1] == 'x') {
                    v[i + 2] = v[i];
                } else {
                    v[i + 2] = !v[i];
                }
            }
        }
        int v0, vn;
        if (v[N - 1]) {
            if (S[N - 1] == 'o') {
                v0 = v[N - 2];
            } else {
                v0 = !v[N - 2];
            }
        } else {
            if (S[N - 1] == 'x') {
                v0 = v[N - 2];
            } else {
                v0 = !v[N - 2];
            }
        }
        if (v[0]) {
            if (S[0] == 'o') {
                vn = v[1];
            } else {
                vn = !v[1];
            }
        } else {
            if (S[0] == 'x') {
                vn = v[1];
            } else {
                vn = !v[1];
            }
        }
        dump(v0, v[0], vn, v[N - 1]);
        if (v0 == v[0] && vn == v[N - 1]) {
            REP(i, N) {
                if (v[i])
                    T += 'S';
                else
                    T += 'W';
            }
            cout << T << endl;
            return 0;
        }
    }
    cout << -1 << endl;
}

Measured memory_bytes: 4112