#include <bits/stdc++.h>
using namespace std;
inline void read(int& n) {
  int x = 0, f = 1;
  char ch = getchar();
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9')
    x = (x << 1) + (x << 3) + ch - '0', ch = getchar();
  n = x * f;
}
int outputarray[20];
inline void write(int k) {
  int num = 0;
  if (k < 0) putchar('-'), k = -k;
  do {
    outputarray[++num] = k % 10, k /= 10;
  } while (k);
  while (num) putchar(outputarray[num--] + '0');
  puts("");
}
const int N = 50;
int n, m, sg[N][N][N][N][2];
char s[N][N];
int dfs(int x0, int x2, int y0, int y2, int type) {
  if (sg[x0][x2][y0][y2][type] >= 0) return sg[x0][x2][y0][y2][type];
  int a[N * N];
  memset(a, 0, sizeof(a));
  for (int i = 0; i < n; i++)
    for (int j = 0; j < m; j++)
      if (((i + j) & 1) == type) {
        int x = i + j, y = i - j + m;
        if (x >= x0 && x < x2 && y >= y0 && y < y2) {
          int tmp = 0;
          if (s[i][j] == 'L')
            tmp = dfs(x0, x, y0, y2, type) ^ dfs(x + 1, x2, y0, y2, type);
          if (s[i][j] == 'R')
            tmp = dfs(x0, x2, y0, y, type) ^ dfs(x0, x2, y + 1, y2, type);
          if (s[i][j] == 'X')
            tmp = dfs(x0, x, y0, y, type) ^ dfs(x0, x, y + 1, y2, type) ^
                  dfs(x + 1, x2, y0, y, type) ^ dfs(x + 1, x2, y + 1, y2, type);
          a[tmp] = 1;
        }
      }
  while (a[++sg[x0][x2][y0][y2][type]])
    ;
  return sg[x0][x2][y0][y2][type];
}
int main() {
  memset(sg, -1, sizeof(sg));
  read(n), read(m);
  for (int i = 0; i < n; i++) scanf("%s", s[i]);
  if (dfs(0, n + m, 0, n + m, 0) ^ dfs(0, n + m, 0, n + m, 1))
    puts("WIN");
  else
    puts("LOSE");
  return 0;
}
