class Bit: #0-indexed
    def __init__(self, n):
        self.size = n
        self.tree = [0] * (n + 1)
 
    def sum(self, i):
        i += 1
        s = 0
        while i > 0:
            s += self.tree[i]
            i -= i & -i
        return s
 
    def add(self, i, x):
        i += 1
        while i <= self.size:
            self.tree[i] += x
            i += i & -i


MOD = 10 ** 9 + 7
compress = lambda arr: {e: i for i, e in enumerate(sorted(set(arr)))}
n, k = map(int, input().split())
a = list(map(int, input().split()))
s = input()
cp = compress(a)
for i in range(n):
    a[i] = cp[a[i]]
fw = [Bit(n) for _ in range(k + 1)]
for i in range(n):
    for j in range(k, 0, -1):
        if s[j - 1] == '<':
            fw[j].add(a[i], fw[j - 1].sum(a[i] - 1) % MOD)
        else:
            fw[j].add(a[i], (fw[j - 1].sum(n - 1) - fw[j - 1].sum(a[i])) % MOD)
    fw[0].add(a[i], 1)
print(fw[k].sum(n - 1) % MOD)