import sys

sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
p2D = lambda x: print(*x, sep="\n")
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
dij = [(0, 1), (1, 0), (0, -1), (-1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = 10**19
# md = 998244353
md = 10**9+7

from collections import defaultdict

n = II()
s = SI()

def cnt(s, t):
    n = len(t)
    dp = [0]*(n+1)
    ctoi = defaultdict(list)
    for i, c in enumerate(t):
        ctoi[c].append(i)

    dp[0] = 1
    for c in s:
        for i in ctoi[c][::-1]:
            dp[i+1] += dp[i]
            dp[i+1] %= md

    return dp[-1]

t = "yukicoder"
tt = [t]
for i in range(len(t)):
    nt = t[:i]+"?"+t[i+1:]
    tt.append(nt)
# print(tt)

ans = 0
for t in tt:
    ans += cnt(s, t)
    ans %= md

print(ans)