#include <bits/stdc++.h>
using namespace std;
long long int mod = 1e9 + 7;
long long int dx[] = {0, 0, 1, -1};
long long int dy[] = {1, -1, 0, 0};
long long int m = 0, n, res = 0, k, ans = 0;
string s2, ch = "", s, t, s1 = "";
vector<pair<string, long long int> > vm;
vector<pair<pair<long long int, long long int>, long long int> > vvv;
vector<pair<long long int, long long int> > vv, vv2;
vector<long long int> v, v2, v1;
set<long long int> st, st1;
long long int a[100];
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  long long int i = 0, x = 0, z = 0, y = 0, j = 0, q, mx = 0, idx = 0, ok = 0,
                l = 0, r = 0, negatif = 0, positif = 0, l1, r1, d, p, t;
  set<pair<long long int, long long int> >::iterator it, it1;
  cin >> s1 >> s2;
  n = s1.size();
  m = s2.size();
  for (i = 0; i < n; i++)
    if (s1[i] == '1') x++;
  for (i = 0; i < m; i++)
    if (s2[i] == '1') y++;
  x += (x & 1);
  if (x >= y) return cout << "YES\n", 0;
  cout << "NO";
  return 0;
}
