#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint = modint1000000007;

template<class S>
struct value_compression : vector<S> {
  bool built = false;
  using VS = vector<S>;
  using VS::vector;
  value_compression(vector<S> v) : vector<S>(move(v)) {}
  void build() {
    sort(VS::begin(), VS::end());
    VS::erase(unique(VS::begin(), VS::end()), VS::end());
    built = true;
  }
  template<class T>
  void convert(T first, T last) { for (; first != last; ++first) *first = (*this)(*first); }
  int operator()(S x) {
    assert(built);
    return lower_bound(VS::begin(), VS::end(), x) - VS::begin();
  }
  void clear() { VS::clear(); built = false; }
};

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, k;
  cin >> n >> k;
  VI a(n);
  rep(i, n) cin >> a[i];
  string s;
  cin >> s;
  value_compression vc = a;
  vc.build();
  vc.convert(all(a));
  int sz = vc.size();
  vector<fenwick_tree<mint>> dp(k + 1, fenwick_tree<mint>(sz));
  for(int x: a) {
    rrep(i, k) {
      mint v = s[i] == '<' ? dp[i].sum(0, x) : dp[i].sum(x + 1, sz);
      dp[i+1].add(x, v);
    }
    dp[0].add(x, 1);
  }
  mint ans = dp[k].sum(0, sz);
  cout << ans.val() << '\n';
}