import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
INF = 2 ** 63 - 1
mod = 10 ** 9 + 7

n, k = mi()
a = li()
s = input()

upgraph = [[] for _ in range(n)]
downgraph = [[] for _ in range(n)]

for i in range(n):
    for j in range(i + 1, n):
        if a[i] < a[j]:
            upgraph[i].append(j)
        elif a[i] > a[j]:
            downgraph[i].append(j)
dp = [[0] * (k + 1) for _ in range(n + 1)]
for i in range(n):
    dp[i][0] = 1
for i in range(n):
    for j in range(max(0, k - (n - i)), k):
        if s[j] == '<':
            for to in upgraph[i]:
                dp[to][j + 1] += dp[i][j]
                dp[to][j + 1] %= mod
        elif s[j] == '>':
            for to in downgraph[i]:
                dp[to][j + 1] += dp[i][j]
                dp[to][j + 1] %= mod

ans = 0
for i in range(n):
    ans += dp[i][k]
    ans %= mod
print(ans)