#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<stdio.h>
#define mod 1000000007
unsigned int dp[2][10];
char* t="yukicoder";
char s[100002],x;
int main(){
  gets(s,8);
  gets(s,100002);
  dp[0][0]=1;
  for(char* p=s;x=*p;++p){
    if(x=='?'){
      for(unsigned int j=0;j<9;++j){
        dp[1][j+1]+=dp[0][j];
        if(dp[1][j+1]>=mod)dp[1][j+1]-=mod;
      }
    }else{
      for(unsigned int j=0;j<9;++j){
        if(x==t[j]){
          dp[0][j+1]+=dp[0][j];
          if(dp[0][j+1]>=mod)dp[0][j+1]-=mod;
          dp[1][j+1]+=dp[1][j];
          if(dp[1][j+1]>=mod)dp[1][j+1]-=mod;
        }
      }
    }
  }
  unsigned int ans=dp[0][9]+dp[1][9];
  if(ans>=mod)ans-=mod;
  printf("%u\n",ans);
}