class SegTree:
    """
    init(init_val, ide_ele): 配列init_valで初期化 O(N)
    update(k, x): k番目の値をxに更新 O(logN)
    query(l, r): 区間[l, r)をsegfuncしたものを返す O(logN)
    """
    def __init__(self, init_val, segfunc, ide_ele):
        """
        init_val: 配列の初期値
        segfunc: 区間にしたい操作
        ide_ele: 単位元
        n: 要素数
        num: n以上の最小の2のべき乗
        tree: セグメント木(1-index)
        """
        n = len(init_val)
        self.segfunc = segfunc
        self.ide_ele = ide_ele
        self.num = 1 << (n - 1).bit_length()
        self.tree = [ide_ele] * 2 * self.num
        # 配列の値を葉にセット
        for i in range(n):
            self.tree[self.num + i] = init_val[i]
        # 構築していく
        for i in range(self.num - 1, 0, -1):
            self.tree[i] = self.segfunc(self.tree[2 * i], self.tree[2 * i + 1])

    def update(self, k, x):
        """
        k番目の値をxに更新
        k: index(0-index)
        x: update value
        """
        k += self.num
        self.tree[k] = x
        while k > 1:
            self.tree[k >> 1] = self.segfunc(self.tree[k], self.tree[k ^ 1])
            k >>= 1

    def query(self, l, r):
        """
        [l, r)のsegfuncしたものを得る
        l: index(0-index)
        r: index(0-index)
        """
        res = self.ide_ele

        l += self.num
        r += self.num
        while l < r:
            if l & 1:
                res = self.segfunc(res, self.tree[l])
                l += 1
            if r & 1:
                res = self.segfunc(res, self.tree[r - 1])
            l >>= 1
            r >>= 1
        return res
    def value(self,index):
        return self.query(index,index+1)
    def opeupdate(self,index,x,ope):
        self.update(index,ope(self.value(index),x))

from collections import defaultdict
def compress(A):
    tmp = defaultdict(int)
    B = list(set(A))
    B.sort()
    zipped = [] #i番目のAの要素は何番目に大きいか
    unzipped = [] # i番目に大きいAの要素は何か
    for index,b in enumerate(B):
        tmp[b] = index
        unzipped.append(b)
    for a in A:
        zipped.append(tmp[a])
    return zipped,unzipped
N,K = map(int,input().split())
mod = 10 ** 9 + 7
A = [0] + list(map(int,input().split()))
S = ['+'] + list(input())
zipped,unzipped = compress(A)
dp = [[0] * (K+1) for _ in range(N+1)]
mX =max(zipped)
seg = [SegTree([0] * (mX+1),lambda x,y:(x+y) % mod ,0) for _ in range(K+1)]
ope = lambda x,y:(x+y) % mod
for i in range(1,N+1):
    dp[i][0] = 1
    seg[0].opeupdate(zipped[i],dp[i][0],ope)
    for k in range(1,K+1):
        if S[k] == '<':
            ind = zipped[i]
            dp[i][k] = seg[k-1].query(0,ind)
        elif S[k] == '>':
            ind = zipped[i]
            dp[i][k] = seg[k-1].query(ind+1,mX+1)
        seg[k].opeupdate(zipped[i],dp[i][k],ope)
print(seg[K].query(0,mX+1))