#include <bits/stdc++.h>
using namespace std;
int main() {
  string one, two;
  cin >> one >> two;
  int odin = 0, dva = 0;
  for (int i = 0; i < one.length(); i++)
    if (one[i] == '1') odin++;
  for (int j = 0; j < two.length(); j++)
    if (two[j] == '1') dva++;
  if (odin & 1 && odin + 1 >= dva)
    cout << "YES";
  else if (!(odin & 1) && odin >= dva)
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
