#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  string a, b;
  cin >> a >> b;
  int one[2];
  one[0] = one[1] = 0;
  for (char ch : a) one[0] += ch == '1' ? 1 : 0;
  for (char ch : b) one[1] += ch == '1' ? 1 : 0;
  if (one[0] + (one[0] & 1) >= one[1])
    cout << "YES";
  else
    cout << "NO";
  return 0;
}
