#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  unsigned long long sum, xo;
  cin >> sum >> xo;
  unsigned long long n = 0;
  unsigned long long rr = sum;
  while (sum) {
    n++;
    sum /= 2;
  }
  sum = rr;
  unsigned long long dp[n + 1][2];
  unsigned long long dp1[n + 1], dp2[n + 1];
  memset(dp, 255, sizeof(dp));
  unsigned long long s1 = sum, s2 = xo;
  for (unsigned long long i = 0; i <= n; i++) {
    dp1[i] = s1 & 1;
    s1 /= 2;
    dp2[i] = s2 & 1;
    s2 /= 2;
  }
  dp[0][0] = 0;
  for (unsigned long long i = 0; i < n; i++) {
    for (unsigned long long j = 0; j < 2; j++)
      for (unsigned long long k = 0; k < 2; k++)
        for (unsigned long long l = 0; l < 2; l++) {
          if (dp[i][l] != dp[0][1])
            if (j ^ k == dp2[i]) {
              if (j ^ k ^ l == dp1[i]) {
                unsigned long long gg = ((j * k + k * l + l * j) > 0) ? 1 : 0;
                unsigned long long hh = 0;
                if (j) hh = j << i;
                dp[i + 1][gg] = min(dp[i + 1][gg], dp[i][l] + hh);
              }
            }
        }
  }
  if (dp[n][0] != dp[0][1])
    cout << dp[n][0] << " " << sum - dp[n][0] << endl;
  else
    cout << "-1" << endl;
  return 0;
}
