import java.io.*;
import java.util.*;

public class Main {
    static final int MOD = 1000000007;
    static ArrayList<HashMap<Integer, HashMap<Integer, Integer>>> dp = new ArrayList<>();
    static int[] values;
    static boolean[] isLower;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int k = sc.nextInt();
        values = new int[n];
        for (int i = 0; i < n; i++) {
            values[i] = sc.nextInt();
        }
        char[] string = (sc.next() + "<").toCharArray();
        isLower = new boolean[k + 1];
        for (int i = 0; i <= k; i++) {
            isLower[i] = (string[i] == '<');
            dp.add(new HashMap<>());
        }
        System.out.println(dfw(k, n - 1, Integer.MAX_VALUE));
    }
    
    static int dfw(int idx, int count, int v) {
        if (count < idx) {
            return 0;
        }
        if (idx < 0) {
            return 1;
        }
        if (!dp.get(idx).containsKey(count)) {
            dp.get(idx).put(count, new HashMap<>());
        }
        if (!dp.get(idx).get(count).containsKey(v)) {
            int ans = dfw(idx, count - 1, v);
            if (isLower[idx]) {
                if (values[count] < v) {
                    ans += dfw(idx - 1, count - 1, values[count]);
                    ans %= MOD;
                }
            } else {
                if (values[count] > v) {
                    ans += dfw(idx - 1, count - 1, values[count]);
                    ans %= MOD;
                }
            }
            dp.get(idx).get(count).put(v, ans);
        }
        return dp.get(idx).get(count).get(v);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}