#include <iostream>
using namespace std;

bool check(int x)
{
	string s;
	for (; x; x /= 10) s += (x % 10 + '0');
	for (int i = 0, j = s.size() - 1; i < j; i ++, j -- )
		if (s[i] != s[j]) return false;
	return true;
}

int main()
{
	for (int i = 1; i < 256; i ++ )
		if (check(i * i)) cout << i << endl;
	return 0;
}