from bisect import bisect_left
import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
mod = int(1e9 + 7)
# mod = 998244353


class fenwick_tree:
    n = 1
    data = [0 for i in range(n)]

    def __init__(self, N):
        self.n = N
        self.data = [0 for i in range(N)]

    def add(self, p, x):
        assert 0 <= p < self.n, "0<=p<n,p={0},n={1}".format(p, self.n)
        p += 1
        while p <= self.n:
            self.data[p - 1] += x
            if self.data[p - 1] >= mod:
                self.data[p - 1] -= mod
            p += p & -p

    def sum(self, l, r):
        assert 0 <= l and l <= r and r <= self.n, "0<=l<=r<=n,l={0},r={1},n={2}".format(
            l, r, self.n
        )
        res = self.sum0(r) - self.sum0(l)
        if res < 0:
            res += mod
        return res

    def sum0(self, r):
        s = 0
        while r > 0:
            s += self.data[r - 1]
            if s >= mod:
                s -= mod
            r -= r & -r
        return s


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

std = sorted(list(set(a)))
for i in range(len(a)):
    a[i] = bisect_left(std, a[i])
m = len(std)


dp = [fenwick_tree(m) for _ in range(k + 1)]
for i in range(n):
    dp[0].add(a[i], 1)
    for j in range(k):
        if s[j] == "<":
            dp[j + 1].add(a[i], dp[j].sum(0, a[i]))
        else:
            dp[j + 1].add(a[i], dp[j].sum(a[i] + 1, m))
print(dp[k].sum(0, m))