mod = 998244353
H, W = map(int, input().split())
S = []
for i in range(H):
  s = input()
  S.append([s[i] for i in range(W)])

dp1 = [[0 for _ in range(W)] for _ in range(H)]
dp2 = [[0 for _ in range(W)] for _ in range(H)]
dp1[1][0] = 1
dp2[0][1] = 1
for h in range(H):
  for w in range(W):
    if h + 1 < H:
      if S[h + 1][w] == '.':
        dp1[h + 1][w] = (dp1[h + 1][w] + dp1[h][w]) % mod
        dp2[h + 1][w] = (dp2[h + 1][w] + dp2[h][w]) % mod
    if w + 1 < W:
      if S[h][w + 1] == '.':
        dp1[h][w + 1] = (dp1[h][w + 1] + dp1[h][w]) % mod
        dp2[h][w + 1] = (dp2[h][w + 1] + dp2[h][w]) % mod
ans = dp1[H - 1][W - 2] * dp2[H - 2][W - 1] - dp2[H - 1][W - 2] * dp1[H - 2][W - 1]
print(ans % mod)