#include <bits/stdc++.h>
#include <atcoder/all>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
#define all(x) x.begin(), x.end()
#define lb(a, x) lower_bound(all(a), x) - a.begin()
using namespace std;
using namespace atcoder;
using ll = long long;
template <class T>	using V = vector<T>;
template <class T>	using BIT = fenwick_tree<T>;
const ll mod = 1000000007;


int main(void) {
	int N, K;	cin >> N >> K;
	V<ll> a(N), b(N);
	rep(i, 0, N) {
		cin >> a[i];
	}
	string s;	cin >> s;

	V<ll> st = a;	sort(all(st));
	st.erase(unique(all(st)), st.end());
	rep(i, 0, a.size()) {
		a[i] = lb(st, a[i]);
		b[i] = st.size() - 1 - a[i];
	}

	V<V<ll> > dp(K + 1, V<ll>(N, 1));
	rep(i, 1, K + 1) {
		BIT<ll> bt(N);
		V<ll> vec = (s[i - 1] == '<') ? a : b;
		rep(j, 0, N) {
			ll k = vec[j];
			bt.add(k, dp[i - 1][j]);
			dp[i][j] = bt.sum(0, (int)k) % mod;
		}
	}

	ll ans = 0;
	for (ll t : dp[K]) {
		ans += t;
		ans %= mod;
	}
	cout << ans << endl;

	return 0;
}