#include <iostream>
using namespace std;
int main() {
// Input
int a, b;
cin >> a >> b;
// Process -> Output
if (a > b) swap(a, b);
int tmp = a / 3;
if (a % 3 != 0) ++tmp;
a = tmp*3;
for (int i = a; i <= b; i += 3)
cout << i << ' ';
return 0;
}
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