def main():
  N=int(input())
  S=input()
  dp=[[0]*2 for __ in range(10)]
  T=set("yukicoder")
  d={"y":0,"u":1,"k":2,"i":3,"c":4,"o":5,"d":6,"e":7,"r":8}
  mod=10**9+7
  for i in range(N):
    if S[i] in T:
      if S[i]=="y":
        dp[0][0]+=1
      else:
        x=d[S[i]]
        dp[x][0]+=dp[x-1][0]
        dp[x][0]%=mod
        dp[x][1]+=dp[x-1][1]
        dp[x][1]%=mod
    elif S[i]=="?":
      dp[0][1]+=1
      for j in range(8):
        dp[j+1][1]+=dp[j][0]
        dp[j+1][1]%=mod
  print((dp[8][0]+dp[8][1])%mod)
  return

main()