mod = 998244353
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    S = []
    for _ in range(N):
        S.append(input().rstrip('\n'))
    S = "".join(S)
    N *= 16
    dp0 = [0] * (N+1)
    dp1 = [0] * (N+1)
    dp0[0] = 1
    for i, s in enumerate(S):
        if s == ".":
            if i & 1:
                dp0[i+1] = (dp0[i] + dp1[i])%mod
                if i+1 < N:
                    if S[i+1] == ".":
                        dp1[i + 1] = ((0 + dp1[i]) % mod * 2)%mod
                    else:
                        dp1[i+1] = (0 + dp1[i])%mod
                else:
                    dp1[i + 1] = ((0 + dp1[i]) % mod * 2) % mod
            else:
                dp0[i+1] = dp0[i]
                if i+1 < N:
                    if S[i+1] == ".":
                        dp1[i + 1] = ((dp0[i] + dp1[i]) % mod * 2)%mod
                    else:
                        dp1[i+1] = (dp0[i] + dp1[i])%mod
                else:
                    dp1[i + 1] = ((dp0[i] + dp1[i]) % mod * 2) % mod
        else:
            if i & 1 == 0:
                dp1[i+1] = (dp0[i] + dp1[i])%mod
            else:
                dp1[i+1] = dp1[i]
    print((dp0[-1] + dp1[-1])%mod)


if __name__ == '__main__':
    main()