#include <algorithm>
#include <bitset>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <memory>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <utility>
#include <vector>

// c++11
#include <array>
#include <tuple>
#include <unordered_map>
#include <unordered_set>

#define mp make_pair
#define mt make_tuple
#define rep(i, n) for (int i = 0; i < (n); i++)

using namespace std;

using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;

const int INF = 1 << 29;
const double EPS = 1e-9;
const ll MOD = 1000000007;

const int dx[] = {1, 0, -1, 0}, dy[] = {0, -1, 0, 1};
/************************************************************
MiniSat -- Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
Copyright (c) 2007-2010  Niklas Sorensson
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
************************************************************/
#include <algorithm>
#include <assert.h>
#include <fstream>
#include <iostream>
#include <list>
#include <queue>
#include <sstream>
#include <stdio.h>
#include <string>
#include <vector>
#include <set>

#include <unordered_map>
#include <unordered_set>
// SAT Solver
// CDCL Solver
// Author togatoga
// https://github.com/togatoga/Togasat
namespace togasat {
  using Var = int;
  using CRef = int;
  using lbool = int;
  const CRef CRef_Undef = -1;
  class Solver {

  private:
    const lbool l_True = 0;
    const lbool l_False = 1;
    const lbool l_Undef = 2;

    const int var_Undef = -1;

    // Literal
    struct Lit {
      int x;
      inline bool operator==(Lit p) const { return x == p.x; }
      inline bool operator!=(Lit p) const { return x != p.x; }
      inline bool operator<(Lit p) const { return x < p.x; }
      inline Lit operator~() {
        Lit q;
        q.x = x ^ 1;
        return q;
      }
    };

    inline Lit mkLit(Var var, bool sign) {
      Lit p;
      p.x = var + var + sign;
      return p;
    };
    inline bool sign(Lit p) const { return p.x & 1; }
    inline int var(Lit p) const { return p.x >> 1; }
    inline int toInt(Var v) { return v; }
    inline int toInt(Lit p) { return p.x; }
    inline Lit toLit(int x) {
      Lit p;
      p.x = x;
      return p;
    }
    const Lit lit_Undef = {-2};
    const Lit lit_Error = {-1};

    // lifted boolean
    // VarData
    struct VarData {
      CRef reason;
      int level;
    };
    inline VarData mkVarData(CRef cr, int l) {
      VarData d = {cr, l};
      return d;
    }
    // Watcher
    struct Watcher {
      CRef cref;
      Lit blocker;
      Watcher() {}
      Watcher(CRef cr, Lit p) : cref(cr), blocker(p) {}
      bool operator==(const Watcher &w) const { return cref == w.cref; }
      bool operator!=(const Watcher &w) const { return cref != w.cref; }
    };

    // Clause
    class Clause {
    public:
      struct {
        bool learnt;
        int size;
      } header;
      std::vector<Lit> data; //(x1 v x2 v not x3)
      Clause() {}
      Clause(const std::vector<Lit> &ps, bool learnt) {
        header.learnt = learnt;
        header.size = ps.size();
        //data = move(ps);
        data.resize(header.size);
        for (int i = 0; i < ps.size(); i++) {
          data[i] = ps[i];
          //   //data.emplace_back(ps[i]);
        }
      }

      int size() const { return header.size; }
      bool learnt() const { return header.learnt; }
      Lit &operator[](int i) { return data[i]; }
      Lit operator[](int i) const { return data[i]; }
    };

    CRef allocClause(std::vector<Lit> &ps, bool learnt = false) {
      static CRef res = 0;
      ca[res] = std::move(Clause(ps, learnt));
      return res++;
    }

    Var newVar(bool sign = true, bool dvar = true) {
      int v = nVars();

      assigns.emplace_back(l_Undef);
      vardata.emplace_back(mkVarData(CRef_Undef, 0));
      activity.emplace_back(0.0);
      seen.push_back(false);
      polarity.push_back(sign);
      decision.push_back(0);
      setDecisionVar(v, dvar);
      return v;
    }

    bool addClause_(std::vector<Lit> &ps) {
      //std::sort(ps.begin(), ps.end());
      // empty clause
      if (ps.size() == 0) {
        return false;
      } else if (ps.size() == 1) {
        uncheckedEnqueue(ps[0]);
      } else {
        CRef cr = allocClause(ps, false);
        //clauses.insert(cr);
        attachClause(cr);
      }

      return true;
    }
    void attachClause(CRef cr) {
      const Clause &c = ca[cr];

      assert(c.size() > 1);

      watches[(~c[0]).x].emplace_back(Watcher(cr, c[1]));
      watches[(~c[1]).x].emplace_back(Watcher(cr, c[0]));
    }

    // Input
    void readClause(const std::string &line, std::vector<Lit> &lits) {
      lits.clear();
      int parsed_lit, var;
      parsed_lit = var = 0;
      bool neg = false;
      std::stringstream ss(line);
      while (ss) {
        int val;
        ss >> val;
        if (val == 0)
        break;
        var = abs(val) - 1;
        while (var >= nVars()) {
          newVar();
        }
        lits.emplace_back(val > 0 ? mkLit(var, false) : mkLit(var, true));
      }
    }

    std::unordered_map<CRef, Clause> ca; // store clauses
    std::unordered_set<CRef> clauses;    // original problem;
    std::unordered_set<CRef> learnts;
    std::unordered_map<int, std::vector<Watcher>> watches;
    std::vector<VarData> vardata; // store reason and level for each variable
    std::vector<bool> polarity;   // The preferred polarity of each variable
    std::vector<bool> decision;
    std::vector<bool> seen;
    // Todo
    int qhead;
    std::vector<Lit> trail;
    std::vector<int> trail_lim;
    // Todo rename(not heap)
    std::set<std::pair<double, Var>> order_heap;
    std::vector<double> activity;
    double var_inc;
    std::vector<Lit> model;
    std::vector<Lit> conflict;
    int nVars() const { return vardata.size(); }
    int decisionLevel() const { return trail_lim.size(); }
    void newDecisionLevel() { trail_lim.emplace_back(trail.size()); }

    inline CRef reason(Var x) const { return vardata[x].reason; }
    inline int level(Var x) const { return vardata[x].level; }
    inline void varBumpActivity(Var v){
      std::pair<double, Var> p = std::make_pair(activity[v], v);
      activity[v] += var_inc;
      if (order_heap.erase(p) == 1){
        order_heap.emplace(std::make_pair(activity[v], v));
      }

      if (activity[v] > 1e100){
        //Rescale
        std::set<std::pair<double,Var>> tmp_order;
        tmp_order = std::move(order_heap);
        order_heap.clear();
        for (int i = 0; i < nVars(); i++){
          activity[i] *= 1e-100;
        }
        for (auto &val : tmp_order){
          order_heap.emplace(std::make_pair(activity[val.second], val.second));
        }
        var_inc *= 1e-100;
      }

    }
    bool satisfied(const Clause &c) const {
      for (int i = 0; i < c.size(); i++) {
        if (value(c[i]) == l_True) {
          return true;
        }
      }
      return false;
    }
    lbool value(Var p) const { return assigns[p]; }
    lbool value(Lit p) const {
      if (assigns[var(p)] == l_Undef) {
        return l_Undef;
      }
      return assigns[var(p)] ^ sign(p);
    }
    void setDecisionVar(Var v, bool b) {
      decision[v] = b;
      order_heap.emplace(std::make_pair(0.0, v));
    }
    void uncheckedEnqueue(Lit p, CRef from = CRef_Undef) {
      assert(value(p) == l_Undef);
      assigns[var(p)] = sign(p);
      vardata[var(p)] = std::move(mkVarData(from, decisionLevel()));
      trail.emplace_back(p);
    }
    // decision
    Lit pickBranchLit() {
      Var next = var_Undef;
      while (next == var_Undef or value(next) != l_Undef) {
        if (order_heap.empty()) {
          next = var_Undef;
          break;
        } else {
          auto p = *order_heap.rbegin();
          next = p.second;
          order_heap.erase(p);
        }
      }
      return next == var_Undef ? lit_Undef : mkLit(next, polarity[next]);
    }
    // clause learning
    void analyze(CRef confl, std::vector<Lit> &out_learnt, int &out_btlevel) {
      int pathC = 0;
      Lit p = lit_Undef;
      int index = trail.size() - 1;
      out_learnt.emplace_back(mkLit(0, false));
      do {
        assert(confl != CRef_Undef);
        Clause &c = ca[confl];
        for (int j = (p == lit_Undef) ? 0 : 1; j < c.size(); j++) {
          Lit q = c[j];
          if (not seen[var(q)] and level(var(q)) > 0) {
            varBumpActivity(var(q));
            seen[var(q)] = 1;
            if (level(var(q)) >= decisionLevel()) {
              pathC++;
            } else {
              out_learnt.emplace_back(q);
            }
          }
        }
        while (not seen[var(trail[index--])])
        ;
        p = trail[index + 1];
        confl = reason(var(p));
        seen[var(p)] = 0;
        pathC--;
      } while (pathC > 0);

      out_learnt[0] = ~p;

      // unit clause
      if (out_learnt.size() == 1) {
        out_btlevel = 0;
      } else {
        int max_i = 1;
        for (int i = 2; i < out_learnt.size(); i++) {
          if (level(var(out_learnt[i])) > level(var(out_learnt[max_i]))) {
            max_i = i;
          }
        }

        Lit p = out_learnt[max_i];
        out_learnt[max_i] = out_learnt[1];
        out_learnt[1] = p;
        out_btlevel = level(var(p));
      }

      for (int i = 0; i < out_learnt.size(); i++) {
        seen[var(out_learnt[i])] = false;
      }
    }

    // backtrack
    void cancelUntil(int level) {
      if (decisionLevel() > level) {
        for (int c = trail.size() - 1; c >= trail_lim[level]; c--) {
          Var x = var(trail[c]);
          assigns[x] = l_Undef;
          polarity[x] = sign(trail[c]);
          order_heap.emplace(std::make_pair(activity[x], x));
        }
        qhead = trail_lim[level];
        trail.erase(trail.end() - (trail.size() - trail_lim[level]), trail.end());
        trail_lim.erase(trail_lim.end() - (trail_lim.size() - level),
        trail_lim.end());
      }
    }
    CRef propagate() {
      CRef confl = CRef_Undef;
      int num_props = 0;
      while (qhead < trail.size()) {
        Lit p = trail[qhead++]; // 'p' is enqueued fact to propagate.
        std::vector<Watcher> &ws = watches[p.x];
        std::vector<Watcher>::iterator i, j, end;
        num_props++;

        for (i = j = ws.begin(), end = i + ws.size(); i != end;) {
          // Try to avoid inspecting the clause:
          Lit blocker = i->blocker;
          if (value(blocker) == l_True) {
            *j++ = *i++;
            continue;
          }

          CRef cr = i->cref;
          Clause &c = ca[cr];
          Lit false_lit = ~p;
          if (c[0] == false_lit)
          c[0] = c[1], c[1] = false_lit;
          assert(c[1] == false_lit);
          i++;

          Lit first = c[0];
          Watcher w = Watcher(cr, first);
          if (first != blocker && value(first) == l_True) {
            *j++ = w;
            continue;
          }

          // Look for new watch:
          for (int k = 2; k < c.size(); k++)
          if (value(c[k]) != l_False) {
            c[1] = c[k];
            c[k] = false_lit;
            watches[(~c[1]).x].emplace_back(w);
            goto NextClause;
          }
          *j++ = w;
          if (value(first) == l_False) { // conflict
            confl = cr;
            qhead = trail.size();
            while (i < end)
            *j++ = *i++;
          } else {
            uncheckedEnqueue(first, cr);
          }
          NextClause:;
        }
        int size = i - j;
        ws.erase(ws.end() - size, ws.end());
      }
      return confl;
    }

    static double luby(double y, int x) {

      // Find the finite subsequence that contains index 'x', and the
      // size of that subsequence:
      int size, seq;
      for (size = 1, seq = 0; size < x + 1; seq++, size = 2 * size + 1)
      ;

      while (size - 1 != x) {
        size = (size - 1) >> 1;
        seq--;
        x = x % size;
      }

      return pow(y, seq);
    }

    lbool search(int nof_conflicts) {
      int backtrack_level;
      std::vector<Lit> learnt_clause;
      learnt_clause.emplace_back(mkLit(-1, false));
      int conflictC = 0;
      while (true) {
        CRef confl = propagate();

        if (confl != CRef_Undef) {
          // CONFLICT
          conflictC++;
          if (decisionLevel() == 0)
          return l_False;
          learnt_clause.clear();
          analyze(confl, learnt_clause, backtrack_level);
          cancelUntil(backtrack_level);
          if (learnt_clause.size() == 1) {
            uncheckedEnqueue(learnt_clause[0]);
          } else {
            CRef cr = allocClause(learnt_clause, true);
            //learnts.insert(cr);
            attachClause(cr);
            uncheckedEnqueue(learnt_clause[0], cr);
          }
          //varDecay
          var_inc *= 1.05;
        } else {
          // NO CONFLICT
          if ((nof_conflicts >= 0 and conflictC >= nof_conflicts)) {
            cancelUntil(0);
            return l_Undef;
          }
          Lit next = pickBranchLit();

          if (next == lit_Undef) {
            return l_True;
          }
          newDecisionLevel();
          uncheckedEnqueue(next);
        }
      }
    };

  public:
    std::vector<lbool> assigns; // The current assignments (ex assigns[0] = 0 ->
      // X1 = True, assigns[1] = 1 -> X2 = False)
      lbool answer;               // SATISFIABLE 0 UNSATISFIABLE 1 UNKNOWN 2
      Solver() { qhead = 0; }
      void parseDimacsProblem(std::string problem_name) {
        std::vector<Lit> lits;
        int vars = 0;
        int clauses = 0;
        std::string line;
        std::ifstream ifs(problem_name, std::ios_base::in);
        while (ifs.good()) {
          getline(ifs, line);
          if (line.size() > 0) {
            if (line[0] == 'p') {
              sscanf(line.c_str(), "p cnf %d %d", &vars, &clauses);
            } else if (line[0] == 'c' or line[0] == 'p') {
              continue;
            } else {
              readClause(line, lits);
              if (lits.size() > 0)
              addClause_(lits);
            }
          }
        }
        ifs.close();
      }
      lbool solve() {
        model.clear();
        conflict.clear();
        lbool status = l_Undef;
        answer = l_Undef;
        var_inc = 1.01;
        int curr_restarts = 0;
        double restart_inc = 2;
        double restart_first = 100;
        while (status == l_Undef) {
          double rest_base = luby(restart_inc, curr_restarts);
          status = search(rest_base * restart_first);
          curr_restarts++;
        }
        answer = status;
        return status;
      };

      void addClause(std::vector<int> &clause) {
        std::vector<Lit> lits;
        lits.resize(clause.size());
        for (int i = 0; i < clause.size(); i++) {
          int var = abs(clause[i]) - 1;
          while (var >= nVars())
          newVar();
          lits[i] = std::move((clause[i] > 0 ? mkLit(var, false) : mkLit(var, true)));
        }
        addClause_(lits);
      }
      void printAnswer() {
        if (answer == 0) {
          std::cout << "SAT" << std::endl;
          for (int i = 0; i < assigns.size(); i++) {
            if (assigns[i] == 0) {
              std::cout << (i + 1) << " ";
            } else {
              std::cout << -(i + 1) << " ";
            }
          }
          std::cout << "0" << std::endl;
        } else {
          std::cout << "UNSAT" << std::endl;
        }
      }
    };
  }


  int N;
  string S;
  int main() {
    cin >> N;
    cin >> S;
    togasat::Solver solver;
    for (int i = 0; i < N; i++){
      vector<int> clause;
      int x,y,z;
      y = (i - 1 + N) % N;
      x = i;
      z = (i + 1) % N;
      y++;
      x++;
      z++;
      if (S[i] == 'o'){

        clause.push_back(-x);
        clause.push_back(y);
        clause.push_back(-z);
        solver.addClause(clause);
        clause.clear();

        clause.push_back(-x);
        clause.push_back(-y);
        clause.push_back(z);
        solver.addClause(clause);
        clause.clear();

        clause.push_back(x);
        clause.push_back(y);
        clause.push_back(z);
        solver.addClause(clause);
        clause.clear();

        clause.push_back(x);
        clause.push_back(-y);
        clause.push_back(-z);
        solver.addClause(clause);
        clause.clear();

      }else{

        clause.push_back(-x);
        clause.push_back(y);
        clause.push_back(z);
        solver.addClause(clause);
        clause.clear();

        clause.push_back(-x);
        clause.push_back(-y);
        clause.push_back(-z);
        solver.addClause(clause);
        clause.clear();

        clause.push_back(x);
        clause.push_back(y);
        clause.push_back(-z);
        solver.addClause(clause);
        clause.clear();

        clause.push_back(x);
        clause.push_back(-y);
        clause.push_back(z);
        solver.addClause(clause);
        clause.clear();
      }
    }
    int res = solver.solve();
    if (res == 0){
      for (int i = 0; i < N; i++){
        if (solver.assigns[i] == 0){
          printf("S");
        }else{
          printf("W");
        }
      }
      cout << endl;
    }else{
      cout << -1 << endl;
    }
    return 0;
  }


Measured memory_bytes: 85720