#include <bits/stdc++.h>
using namespace std;
pair<int, int> getPos (char direct, pair<int, int> pos) {
if (direct == 'N' || direct == '^') return {pos.first-1, pos.second};
if (direct == 'S' || direct == 'v') return {pos.first+1, pos.second};
if (direct == 'E' || direct == '>') return {pos.first, pos.second+1};
return {pos.first, pos.second-1};
}
int main () {
cin.tie(0)->sync_with_stdio(0);
int r, s;
cin >> r >> s;
char c;
pair<int, int> init_pos;
vector<vector<char>> grid(r, vector<char>(s));
for (int i = 0; i < r; i++) {
for (int j = 0; j < s; j++) {
cin >> c;
grid[i][j] = c;
if (c == 'o') init_pos = {i, j};
}
}
vector<pair<int, char>> valid;
vector<char> direction = {'N', 'E', 'S', 'W'};
int dist = 0;
for (int i = 0; i < 4; i++) {
pair<int, int> pos = getPos(direction[i], init_pos);
dist = 0;
while (grid[pos.first][pos.second] != '.') {
if (grid[pos.first][pos.second] == 'x') {
valid.push_back({dist, direction[i]});
break;
}
pos = getPos(grid[pos.first][pos.second], pos);
dist++;
}
}
if (valid.empty()) {
cout << ":(";
return 0;
}
sort(valid.begin(), valid.end());
cout << ":)\n" << valid.front().second;
return 0;
}
