#include <bits/stdc++.h>
using namespace std;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, m, sx, sy;
cin >> n >> m;
vector<string> a(n);
for (string &s : a) cin >> s;
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
if (a[i][j] == 'o') {
sx = i;
sy = j;
}
}
}
string dir = "ENSW";
string sign = ">^v<";
int dx[4] = {0, -1, 1, 0};
int dy[4] = {1, 0, 0, -1};
const int inf = 1e9;
vector<int> dis(4, inf);
for (int _ = 0; _ < 4; _++) {
int x = sx, y = sy;
vector<vector<int>> d(n, vector<int>(m, -1));
d[x][y] = 0;
x += dx[_], y += dy[_];
if (min({x, y, n - x - 1, m - y - 1}) < 0) continue;
d[x][y] = 1;
while (true) {
if (a[x][y] == 'x') {
dis[_] = d[x][y];
break;
}
if (a[x][y] == '.') {
break;
}
int p = sign.find(a[x][y]);
x += dx[p], y += dy[p];
if (min({x, y, n - x - 1, m - y - 1}) < 0 || d[x][y] >= 0) break;
d[x][y] = d[x - dx[p]][y - dy[p]] + 1;
}
}
int k = *min_element(dis.begin(), dis.end());
for (int i = 0; i < 4; i++) {
if (dis[i] == k && dis[i] != inf) {
cout << ":)\n" << dir[i] << '\n';
return 0;
}
}
cout << ":(";
return 0;
}
