N = int(input())
S = '.'+''.join([input() for _ in range(N)])+'.'
MOD = 998244353
ans = [0]*3
ans[0] = 1
T = '.dk'
U = [T.index(s) for s in S]

dp = [[0]*3 for _ in range(16*N+1)]
dp[0] = [1, 0, 0]

for i in range(1, 16*N+1):
    s = U[i]
    if s:
        dp[i][s] = sum(dp[i-1]) % MOD
    else:
        if i % 2:
            if U[i+1] == 0:
                dp[i][0] = dp[i-1][0]
            if U[i+1] != 1:
                dp[i][1] = sum(dp[i-1]) % MOD
            if U[i+1] != 2:
                dp[i][2] = sum(dp[i-1]) % MOD
        else:
            dp[i][0] = sum(dp[i-1]) % MOD
            if U[i+1] != 1:
                dp[i][1] = (sum(dp[i-1])-dp[i-1][0]) % MOD
            if U[i+1] != 2:
                dp[i][2] = (sum(dp[i-1])-dp[i-1][0]) % MOD

print(sum(dp[-1]) % MOD)