//愚直解（爆速）

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <stdio.h>
#include <stdlib.h>
#define u32 unsigned int
#define mod 1000000007
#define MAX_DATA 1500

int main(void) {
	int i, j, k;
	int N, K;	scanf("%d", &N);	scanf("%d", &K);
	int a[MAX_DATA] = { 0 };
	for (i = 0; i < N; ++i) {
		scanf("%d", a + i);
	}
	char s[MAX_DATA];
	scanf("%s", s);

	u32 dp[MAX_DATA] = { 0 };
	u32 ndp[MAX_DATA] = { 0 };
	for (i = 0; i < N; ++i) {
		dp[i] = 1;
	}
	for (i = 0; i < K; ++i) {
		int t = (s[i] == '<') ? 1 : -1;
		for (j = 0; j < N; ++j) {
			ndp[j] = 0;
			for (k = 0; k < j; ++k) {
				ndp[j] += (u32)((a[k] - a[j]) * t < 0) * dp[k];
				if (ndp[j] >= mod)
					ndp[j] %= mod;
			}
		}
		for (j = 0; j < N; ++j) {
			dp[j] = ndp[j];
		}
	}

	u32 ans = 0;
	for (i = 0; i < N; ++i) {
		ans += dp[i];
		if (ans >= mod)
			ans %= mod;
	}
	printf("%u\n", ans);

	return 0;
}