#include<bits/stdc++.h>

using namespace std;
typedef unsigned int uint;
typedef long long int ll;
typedef unsigned long long int ull;

#define debugv(v) printf("L%d %s => ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;
#define debugm(m) printf("L%d %s is..\n",__LINE__,#m);for(auto v:m){for(auto e:v){cout<<e<<" ";}cout<<endl;}
#define debuga(m,w) printf("L%d %s is => ",__LINE__,#m);for(int x=0;x<(w);x++){cout<<(m)[x]<<" ";}cout<<endl;
#define debugaa(m,w,h) printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[x][y]<<" ";}cout<<endl;}
#define debugaar(m,w,h) printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[y][x]<<" ";}cout<<endl;}
#define ALL(v) (v).begin(),(v).end()
#define BIGINT 0x7FFFFFFF
#define E107 1000000007ll
void printbit(int u) { if (u == 0)cout << 0; else { int s = 0, k = 0; for (; 0<u; u >>= 1, k++)s = (s << 1) | (u & 1); for (; 0<k--; s >>= 1)cout << (s & 1); } }

#define TIME chrono::system_clock::now()
#define MILLISEC(t) (chrono::duration_cast<chrono::milliseconds>(t).count())

namespace {
    std::chrono::system_clock::time_point t;
    void tic() { t = TIME; }
    void toc() { fprintf(stderr, "TIME : %lldms\n", MILLISEC(TIME - t)); }
}

template<typename T1, typename T2>
ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << "(" << p.first << ":" << p.second << ")"; return o; }

int width, height;
ll m, n;


string anim;

char res[100010];

int main() {
    int i, j, k;
    int x, y, a, b;

    cin >> n; cin.ignore();

    cin >> anim;

    //sat_2 sat(n);

    for (int t = 0; t < 4; ++t) {
        switch (t) {
        case 0:
            res[0] = 'S';
            res[1] = 'S';
            break;
        case 1:
            res[0] = 'S';
            res[1] = 'W';
            break;
        case 2:
            res[0] = 'W';
            res[1] = 'S';
            break;
        case 3:
            res[0] = 'W';
            res[1] = 'W';
        }
        for (k = 2; k < n; k++) {
            i = (k - 2 + n) % n;
            j = (k - 1 + n) % n;
            if (anim[j] == 'o' && res[i] == 'S' && res[j] == 'S') {
                res[k] = 'S';
            }
            else if (anim[j] == 'x' && res[i] == 'S' && res[j] == 'W') {
                res[k] = 'S';
            }
            else if (anim[j] == 'x' && res[i] == 'W' && res[j] == 'S') {
                res[k] = 'S';
            }
            else if (anim[j] == 'o' && res[i] == 'W' && res[j] == 'W') {
                res[k] = 'S';
            }
            else if (anim[j] == 'x' && res[i] == 'S' && res[j] == 'S') {
                res[k] = 'W';
            }
            else if (anim[j] == 'o' && res[i] == 'W' && res[j] == 'S') {
                res[k] = 'W';
            }
            else if (anim[j] == 'o' && res[i] == 'S' && res[j] == 'W') {
                res[k] = 'W';
            }
            else if (anim[j] == 'x' && res[i] == 'W' && res[j] == 'W') {
                res[k] = 'W';
            }
            else{
                abort();
            }
        }
        bool fail = false;
        for (k = 0; k < 2; ++k) {
            i = (k - 2 + n) % n;
            j = (k - 1 + n) % n;
            if (((res[i] == res[k] ^ anim[j] == 'x') ^ res[j] == 'W')) {
                ;
            }
            else {
                fail = true;
            }
        }
        if (!fail) {
            cout << res << endl;
            return 0;
        }

    }
    cout << -1 << endl;

    return 0;
}

Measured memory_bytes: 640