#include <bits/stdc++.h>
using namespace std;
int a, b, k, m, maxa, minb, tem;
int main() {
  cin >> a >> b >> k >> m;
  for (int i = 0; i < a; i++) {
    cin >> tem;
    if (i == k - 1) maxa = tem;
  }
  for (int i = 0; i < b; i++) {
    cin >> tem;
    if (i == b - m) minb = tem;
  }
  cout << (maxa < minb ? "YES" : "NO") << endl;
}
