#include <iostream>
using namespace std;

int main() {
    int i=0;
    while(i<=256)
    {
        int m = i*i;
        int x =0;
        int j = m;
        while(j>0)
        {
            int k = j%10;
            j = j / 10;
            x = x*10+k;
        }
        if(m==x)
        {
            printf("%d\n",i);
        }
        i++;
    }
}