/* -*- coding: utf-8 -*-
 *
 * 1702.cc:  No.1702 count good string - yukicoder
 */

#include<cstdio>
 
using namespace std;

/* constant */

const int MAX_N = 100000;
const int L = 9;
const char t[] = "yukicoder";
const int MOD = 1000000007;

/* typedef */

typedef long long ll;

/* global variables */

char s[MAX_N + 4];
int dp[MAX_N + 1][L + 1];

/* subroutines */

inline void addmod(int &a, int b) { a = (a + b) % MOD; }

/* main */

int main() {
  int n;
  scanf("%d%s", &n, s);

  dp[0][0] = 1;
  for (int i = 0; i < n; i++)
    for (int j = 0; j <= L; j++)
      if (dp[i][j] > 0) {
	addmod(dp[i + 1][j], dp[i][j]);
	if (j < L && (s[i] == '?' || s[i] == t[j]))
	  addmod(dp[i + 1][j + 1], dp[i][j]);
      }

  printf("%d\n", dp[n][L]);
  return 0;
}