#include <bits/stdc++.h>
using namespace std;
const int N = 65;
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};
string d2ch = "NESW";
vector<int> order = {1, 0, 2, 3};
int k, n, m;
string s;
int sx, sy;

string ans;
int ty[N];
int vis[N][N], px[N], py[N];
inline int GetDir(int x, int y, int u, int v) {
    if (x == u) return v < y ? 3 : 1;
    return u < x ? 0 : 2;
}
inline int Check(int ps) {
    if (s[ps] == '.') return 1;
    if (s[ps] == 'W') return (ty[(ps + 1) % k] || ty[(ps + k - 1) % k]);
    return ty[ps] && !ty[(ps + 1) % k] && !ty[(ps + k - 1) % k];
}
inline void Dfs(int x, int y, int ps) {
    px[ps] = x; py[ps] = y;
    if (ps == k - 1) {
        // cerr << ans << endl;
        // cerr << x << ' ' << y << endl;
        if (abs(x - sx) + abs(y - sy) != 1) return;
        ans[ps] = d2ch[GetDir(x, y, sx, sy)];
        ty[ps] = ((GetDir(sx, sy, x, y) - GetDir(x, y, px[ps - 1], py[ps - 1]) + 4) % 4 & 1);
        ty[0] = ((GetDir(px[0], py[0], px[1], py[1]) - GetDir(px[0], px[0], x, y) + 4) % 4 & 1);
        if (Check(ps) && Check(ps - 1) && Check(0) && Check(1)) {
            cout << ans << endl;
            exit(0);
        }
        return;
    }
    vis[x][y] = 1;
    for (auto d : order) {
        int nx = x + dx[d], ny = y + dy[d];
        if (nx > 0 && ny > 0 && nx <= n && ny <= m && !vis[nx][ny]) {
            ans[ps] = d2ch[d];
            if (ps >= 1) ty[ps] = (d - GetDir(x, y, px[ps - 1], py[ps - 1]) + 4) % 4 & 1;   
            if (ps >= 3 && !Check(ps - 1)) continue;
            Dfs(nx, ny, ps + 1);
        }
    }
    vis[x][y] = 0;
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> k >> n >> m;
    cin >> s;
    cin >> sx >> sy;
    ans.resize(k);
    Dfs(sx, sy, 0);
    cout << "impossible\n";
    return 0;
}