import sys
sys.setrecursionlimit(3*10**5)

mod=998244353
s=input()
n=len(s)

mex=[[1,2,1],
     [2,0,0],
     [1,0,0]]

idx=0
def calc():
  global idx
  if s[idx] in '012?':
    dp=[0]*3
    if s[idx] in '012':
      dp[int(s[idx])]=1
    else:
      dp=[1]*3
    idx+=1
    return dp
  c=s[idx+1]
  idx+=4
  dpL=calc()
  idx+=1
  dpR=calc()
  dp=[0]*3
  if c=='a' or c=='?':
    for i in range(3):
      for j in range(3):
        dp[max(i,j)]+=dpL[i]*dpR[j]
  if c=='e' or c=='?':
    for i in range(3):
      for j in range(3):
        dp[mex[i][j]]+=dpL[i]*dpR[j]
  idx+=1
  return [i%mod for i in dp]

k=int(input())
print(calc()[k])