#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>
#include<bits/stdc++.h>
#include<atcoder/all>

using namespace std;
using namespace atcoder;
using ll = long long;
using mint = modint1000000007;

template<class T> struct BIT {
    vector<T> bit;
    long long N;

    BIT (long long n){
        N = n;
        bit.resize(N);
    }

    void add(long long loc, T val){
        loc++;
        while(loc <= N){
            bit[loc-1] += val;
            loc += loc & -loc;
        }
    }

    T sum(long long l, long long r){
        T res = _sum(r) - _sum(l-1);
        return res;
    }

    T _sum(long long r){
        r++;
        T res = 0;
        while(r > 0){
            res += bit[r-1];
            r -= r & -r;
        }
        return res;
    }
};

template <typename T>
void compress(vector<T> &A){

    map<T, T> comp;
    int N = A.size(), i=0;
    for (int i=0; i<N; i++) comp[A[i]];

    for (auto &e : comp){
        e.second = i;
        i++;
    }

    for (int i=0; i<N; i++) A[i] = comp[A[i]];
}

int main(){

    ll N, K;
    string S;
    cin >> N >> K;
    vector<ll> A(N);
    for (int i=0; i<N; i++) cin >> A[i];
    cin >> S;
    compress(A);
    vector<BIT<mint>> dp(K+1, BIT<mint>(N));

    for (int i=0; i<N; i++){
        for (int j=1; j<=K; j++){
            if (S[j-1] == '<') dp[j].add(A[i], dp[j-1].sum(0, A[i]-1));
            else dp[j].add(A[i], dp[j-1].sum(A[i]+1, N-1));
        }
        dp[0].add(A[i], 1);
    }

    cout << dp[K].sum(0, N-1).val() << endl;

    return 0;
}