#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast,O3,unroll-loops")
#define int long long
#define vi vector<int>
#define vvi vector<vi>
#define pii pair<int, int>
#define vpi vector<pii>
#define vvpi vector<vpi>
#define vb vector<bool>
#define vvb vector<vb>
#define endl "\n"
#define sp << " " <<
#define F(i, s, n) for(int i = s; i < n; i++)
#define pb push_back
#define fi first
#define se second
int inf = LLONG_MAX >> 3;
int n, m;
string grid[100];
int floodfill(int y, int x, int d = 0) {
if(x < 0 || y < 0 || x >= m || y >= n || grid[y][x] == '.') return inf;
if(grid[y][x] == 'x') {
return d;
}
if(grid[y][x] == '^') return floodfill(y-1, x, d+1);
if(grid[y][x] == 'v') return floodfill(y+1, x, d+1);
if(grid[y][x] == '<') return floodfill(y, x-1, d+1);
if(grid[y][x] == '>') return floodfill(y, x+1, d+1);
return inf;
}
void solve() {
cin >> n >> m;
F(i, 0, n) cin >> grid[i];
int y, x;
F(i, 0, n) {
F(j, 0, m) {
if(grid[i][j] == 'o') {
y = i;
x = j;
break;
}
}
}
string ans = "";
int mn = inf;
int r;
r = floodfill(y, x+1); if(r < mn) {ans = "E"; mn = r;}
r = floodfill(y-1, x); if(r < mn) {ans = "N"; mn = r;}
r = floodfill(y+1, x); if(r < mn) {ans = "S"; mn = r;}
r = floodfill(y, x-1); if(r < mn) {ans = "W"; mn = r;}
if(ans.length() > 0) cout << ":)\n" << ans << endl;
else cout << ":(" << endl;
}
void setIO() {
ios::sync_with_stdio(0); cin.tie(0);
#ifdef Local
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
#endif
}
signed main() {
setIO();
solve();
}
