class SegmentTree(object):
    def __init__(self, A, dot, unit):
        n = 1 << (len(A) - 1).bit_length()
        tree = [unit] * (2 * n)
        for i, v in enumerate(A):
            tree[i + n] = v
        for i in range(n - 1, 0, -1):
            tree[i] = dot(tree[i << 1], tree[i << 1 | 1])
        self._n = n
        self._tree = tree
        self._dot = dot
        self._unit = unit

    def __getitem__(self, i):
        return self._tree[i + self._n]

    def update(self, i, v):
        i += self._n
        self._tree[i] = v
        while i != 1:
            i >>= 1
            self._tree[i] = self._dot(self._tree[i << 1], self._tree[i << 1 | 1])

    def add(self, i, v,ope):
        self.update(i, ope(self[i],v))

    def sum(self, l, r): #これで[l,r)から取り出す。
        l += self._n
        r += self._n
        l_val = r_val = self._unit
        while l < r:
            if l & 1:
                l_val = self._dot(l_val, self._tree[l])
                l += 1
            if r & 1:
                r -= 1
                r_val = self._dot(self._tree[r], r_val)
            l >>= 1
            r >>= 1
        return self._dot(l_val, r_val)
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
from sys import stdin
input = stdin.readline
N,K = map(int,input().split())
mod = 10 ** 9 + 7
A = [0] + list(map(int,input().split()))
S = ['+'] + list(input())
zipped,unzipped = compress(A)
def cnv(i,k):
    return (K+1) * i + k 
mX =max(zipped)
seg = [SegmentTree([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):
    seg[0].add(zipped[i],1,ope)
    for k in range(1,K+1):
        if S[k] == '<':
            ind = zipped[i]
            tmp = seg[k-1].sum(0,ind)
        elif S[k] == '>':
            ind = zipped[i]
            tmp = seg[k-1].sum(ind+1,mX+1)
        seg[k].add(zipped[i],tmp,ope)
ans = 0
for ind in sorted(list(set(zipped))):
    ans += seg[K][ind]
    ans %= mod
print(ans)