def main():
  N=int(input())
  S=input()
  dp=[[0]*2 for i in range(9)]
  mod=10**9+7
  u={"y":0,"u":1,"k":2,"i":3,"c":4,"o":5,"d":6,"e":7,"r":8}
  t=list("yukicoder")
  for i in range(N):
    if S[i]==t[0]:
      dp[0][0]+=1
      dp[0][0]%=mod
    elif S[i] in t:
      for j in range(1,9):
        if S[i]==t[j]:
          dp[u[t[j]]][0]+=dp[u[t[j]]-1][0]
          dp[u[t[j]]][0]%=mod
          dp[u[t[j]]][1]+=dp[u[t[j]]-1][1]
          dp[u[t[j]]][1]%=mod
          break
    elif S[i]=='?':
      dp[0][1]+=1
      dp[0][1]%=mod
      for j in range(1,9):
        dp[u[t[j]]][1]+=dp[u[t[j]]-1][0]
        dp[u[t[j]]][1]%=mod
  print((dp[8][0]+dp[8][1])%mod)
  return
  
main()