#include <iostream>
using namespace std;

int main() {
	int b, c;
	for (int i = 1000; i <= 9999; i++) {
		b = i / 100;
		c = i % 100;
		if ((c + b) * (c + b) == i) {
			cout << i << endl;
		}
	}
	return 0;
}