#include<iostream>
using namespace std;
bool check(int x)
{
if(x == 0) return true;
int c = 0, sum = 0, t = x;
while(x != 0)
{
c = x % 10;
sum = sum * 10 + c;
x /= 10;
}
return sum == t;
}
int main()
{
for(int i = 0; i <= 256; i ++)
{
if(check(i * i)) cout << i << endl;
}
return 0;
}