#include <bits/stdc++.h>

#define f first
#define s second
#define pb push_back
#define mp make_pair

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;

const int N = 300500, inf = 1e9, mod = 998244353;
const ll INF = 1e18;

int sum(int a, int b) {
    a += b;
    if (a >= mod)
        a -= mod;
    return a;
}

int sub(int a, int b) {
    a -= b;
    if (a < 0)
        a += mod;
    return a;
}

int mult(int a, int b) {
    return 1ll * a * b % mod;
}

int bp(int a, int b) {
    int res = 1;
    while (b) {
        if (b & 1)
            res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}

int inv(int x) {
    return bp(x, mod - 2);
}

int n, m;
string s[N];


pii val[30][30], emp = {-1, -1};

int timer, was[30][30][30][30];
int dp[30][30][30][30];

int tt, wt[N];

//char F = 'B';
char F = 'R';

int get(int xl, int xr, int yl, int yr) {
    if (xl > xr || yl > yr)
        return 0;
    if (was[xl][xr][yl][yr] == timer)
        return dp[xl][xr][yl][yr];
    was[xl][xr][yl][yr] = timer;
    int res = 0;
    for (int x = xl; x <= xr; x++) {
        for (int y = yl; y <= yr; y++) {
            if (val[x][y] == emp)
                continue;
            int cur = 0;
            if (s[val[x][y].f][val[x][y].s] == 'G') {
                cur ^= get(xl, x - 1, yl, y - 1);
                cur ^= get(x + 1, xr, yl, y - 1);
                cur ^= get(xl, x - 1, y + 1, yr);
                cur ^= get(x + 1, xr, y + 1, yr);
            } else if (s[val[x][y].f][val[x][y].s] == F) {
                cur ^= get(xl, x - 1, yl, yr);
                cur ^= get(x + 1, xr, yl, yr);
            } else {
                cur ^= get(xl, xr, yl, y - 1);
                cur ^= get(xl, xr, y + 1, yr);
            }
        }
    }
    tt++;
    for (int x = xl; x <= xr; x++) {
        for (int y = yl; y <= yr; y++) {
            if (val[x][y] == emp)
                continue;
            int cur = 0;
            if (s[val[x][y].f][val[x][y].s] == 'G') {
                cur ^= get(xl, x - 1, yl, y - 1);
                cur ^= get(x + 1, xr, yl, y - 1);
                cur ^= get(xl, x - 1, y + 1, yr);
                cur ^= get(x + 1, xr, y + 1, yr);
            } else if (s[val[x][y].f][val[x][y].s] == F) {
                cur ^= get(xl, x - 1, yl, yr);
                cur ^= get(x + 1, xr, yl, yr);
            } else {
                cur ^= get(xl, xr, yl, y - 1);
                cur ^= get(xl, xr, y + 1, yr);
            }
            wt[cur] = tt;
        }
    }
    while(wt[res] == tt)
        res++;
    return dp[xl][xr][yl][yr] = res;
}

void solve() {
    cin >> n >> m;
    if(n == 1 || m == 1){
        if((n + m) % 2 == 1)
            cout << "L\n";
        else
            cout << "W\n";
        return;
    }
    for (int i = 0; i < n; i++)
        cin >> s[i];
    int ans = 0;
    for (int it = 0; it < 2; it++) {
        timer++;
        for (int i = 0; i < 30; i++)
            for (int j = 0; j < 30; j++)
                val[i][j] = emp;
        for (int i = 0; i < n; i++)
            for (int j = 0; j < m; j++)
                if ((i ^ j ^ it) & 1) {
                    int x = i + j;
                    int y = i - j + m;
                    x /= 2;
                    y /= 2;
                    val[x][y] = {i, j};
                }
        ans ^= get(0, 29, 0, 29);
    }

    if (ans == 0)
        cout << "L\n";
    else
        cout << "W\n";
}

int main() {
#ifdef DEBUG
    freopen("input.txt", "r", stdin);
#endif
    ios_base::sync_with_stdio(false);
    int t = 1;
//    cin >> t;
    for (int i = 1; i <= t; i++) {
//        cout << "Case #" << i << endl;
        solve();
    }
}