//TLE(?)

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


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

	V<V<int> > up(N, V<int>({}));
	V<V<int> > down(N, V<int>({}));
	rep(i, 0, N) {
		rep(j, 0, i) {
			if (a[j] > a[i]) {
				up[i].push_back(j);
			}
			if (a[j] < a[i]) {
				down[i].push_back(j);
			}
		}
	}

	V<ll> dp(N, 1);
	rep(i, 0, K) {
		V<ll> ndp(N);
		rep(j, 0, N) {
			if (s[i] == '<') {
				for (int k : down[j]) {
					ndp[j] += dp[k];
					ndp[j] %= mod;
				}
			}
			else {
				for (int k : up[j]) {
					ndp[j] += dp[k];
					ndp[j] %= mod;
				}
			}
		}
		dp = ndp;
	}

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

	return 0;
}