N=int(input())
A=tuple(input().split())
B=tuple(input().split())
MOD=998244353
dp=[[[[[0 for XLeading in range(2)] for l in range(34)] for k in range(5)] for j in range(10)] for i in range(N+9)]
dp[0][0][0][0][0] = 1

for i in range(N):
  A_num = int(A[i])
  for j in range(10):
    for k in range(5):
      for l in range(34):
        for XL in range(2):
          dp[i+1][j][k][l][XL] = dp[i][j][k][l][XL]
          dp[i+1][j][k][l][XL] %= MOD
  if B[i]=="X" or B[i][-1]=="X":
    B_num = (0 if B[i]=="X" else int(B[i][:-1]))
    for j in range(9):
      for k in range(5):
        for l in range(34):
          if k+A_num<=4 and l+B_num<=33:
            dp[i+1][j+1][k+A_num][l+B_num][1] += dp[i][j][k][l][0]
            dp[i+1][j+1][k+A_num][l+B_num][1] %= MOD
  else:
    B_num = int(B[i])
    for j in range(9):
      for k in range(5):
        for l in range(34):
          for XL in range(2):
            if k+A_num<=4 and l+B_num<=33:
              dp[i+1][j+1][k+A_num][l+B_num][XL] += dp[i][j][k][l][XL]
              dp[i+1][j+1][k+A_num][l+B_num][XL] %= MOD

print(dp[N][9][4][33][1]%MOD)