#include<bits/stdc++.h>
#include<atcoder/all>
using namespace atcoder;
//using mint = modint1000000007;
using mint = modint998244353;
//g++ -I/opt/ac-library ./**.cpp
using namespace std;
using ll = long long;
using ull = unsigned long long;
const long long MOD = 1000000007;
const long double PI = 3.14159265358979;
const long long INF = 1LL<<60;
template <typename T> bool chmax(T &a, const T& b){if(a < b){a = b;return true;}return false;}
template <typename T> bool chmin(T &a, const T& b){if(a > b){a = b;return true;}return false;}
#define deb(var) do{cout << #var << " : "; view(var);}while(0)
template<typename T> void view(T e){cout << e << endl;}
void view(vector<string>& v){cout << endl;for(auto& s :v){view(s);}cout << endl;}
template<typename T> void view(vector<T>& v){for(auto& e :v){cout << e << " ";}cout << endl;}
template<typename T> void view(vector<vector<T>>& vv){cout << endl;for(auto& v:vv){view(v);}}
ll gcd(ll a, ll b){if (b == 0) return a;else return gcd(b, a % b);}
ll lcm(ll x,ll y){return ll(x/gcd(x,y))*y;}
template<typename T> using min_priority_queue = priority_queue<T, vector<T>, greater<T>>;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define int long long

template<class T>
struct compress{
    vector<int> res;
    vector<T> comp, A_copy;
    int n;
    int siz; //圧縮後の種類数
    compress(vector<T>& A){
        n = A.size();
        res.resize(n);
        comp = A;
        A_copy = A;
        init();
    }

    void init(){
        sort(comp.begin(), comp.end());
        comp.erase(unique(comp.begin(), comp.end()), comp.end());
        siz = comp.size();
        for(int i=0; i<n; i++){
            res[i] = lower_bound(comp.begin(), comp.end(), A_copy[i]) - comp.begin();
        }
    }

    //座圧後の種類数
    int max() {
        return comp.size();
    }

    //圧縮後の値を渡すと元の値を返す．
    T raw(int a){
        return comp[a];
    }

    //座圧前の値を座圧後の値に変換
    int press(T a) {
        return lower_bound(comp.begin(), comp.end(), a) - comp.begin();
    }
};

int op(int a, int b) {
    return (a + b) % MOD;
}

int e() {
    return 0LL;
}

segtree<int, op, e> seg(10);

int32_t main() {
    int n, k; cin >> n >> k;
    vector<int> a(n);
    string s;
    for (int i=0; i<n; i++) {
        cin >> a[i];
    }
    compress<int> C(a);
    for (int i=0; i<n; i++) {
        a[i] = C.press(a[i]);
    }
    cin >> s;
    int mx = C.max();
    vector<segtree<int, op, e>> dp(k + 1, segtree<int, op, e> (mx + 1));
    for (int i=1; i<=n; i++) {
        int v = a[i - 1];
        for (int j=1; j<=min(k, i); j++) {
            if (s[j - 1] == '<') {
                dp[j].set(v, (dp[j].get(v) + dp[j - 1].prod(0LL, v)) % MOD);
            }
            else {
                dp[j].set(v, (dp[j].get(v) + dp[j - 1].prod(v + 1, mx)) % MOD);
            }
        }
        dp[0].set(v, dp[0].get(v) + 1LL);
    }

    int ans = dp[k].all_prod();
    cout << ans << "\n";
}