include <bits/stdc++.h>
using namespace std;
int main() {
int n = 0, m = 0;
int l, r, k, a, c, b;
cin >> a >> b;
for (int i = 0; i < 1000; i++) {
m = n + a;
if (((m - b) / (n - b) == 2) && ((m - b) % (n - b) == 0)) {
cout << m << n;
}
n = n + 1;
}
return 0;
}