class DualBIT():
    def __init__(self, init):
        if type(init) == int:
            self.n = init + 1
            self.X = [0] * self.n
        else:
            self.n = len(init) + 1
            self.X = [0] + init
            for i in range(1, self.n):
                if i + (i & -i) < self.n:
                    self.X[i + (i & -i)] += self.X[i]
    def _add(self, i, x=1):
        i += 1
        while i < self.n:
            self.X[i] = (self.X[i] + x) % P
            i += i & (-i)

    def add_range(self, l, r, x=1):
        self._add(l, x)
        self._add(r, -x)
    
    def getvalue(self, i):
        ret = 0
        i += 1
        while i != 0:
            ret = (ret + self.X[i]) % P
            i -= i & (-i)
        return ret
    
    def disp(self):
        return [self.getvalue(i) for i in range(N)]

P = 10 ** 9 + 7
N, K = map(int, input().split())
A = [int(a) for a in input().split()]
S = [1 if s == "<" else -1 for s in input()]
SA = sorted(set(A))
IA = {a: i for i, a in enumerate(SA)}
AA = [IA[a] for a in A]
M = len(SA)
bits = [DualBIT(N) for _ in range(K + 1)]
bits[0].add_range(0, M, 1)
ans = 0
for i in range(N):
    a = AA[i]
    for j in range(1, K + 1)[::-1]:
        c = bits[j].getvalue(a)
        if j == K:
            ans += c
            continue
        s = S[j]
        if s > 0:
            bits[j+1].add_range(a + 1, M, c)
        else:
            bits[j+1].add_range(0, a, c)
    
    s = S[0]
    if s > 0:
        bits[1].add_range(a + 1, M, 1)
    else:
        bits[1].add_range(0, a, 1)
print(ans % P)