#include <bits/stdc++.h>
using namespace std;
int main() {
  int na, nb, k, m;
  cin >> na >> nb >> k >> m;
  int a[na], b[nb];
  for (int i = 0; i < na; ++i) cin >> a[i];
  for (int i = 0; i < nb; ++i) cin >> b[i];
  if (a[k - 1] < b[nb - m]) {
    cout << "YES";
  } else {
    cout << "NO";
  }
  return 0;
}
