#include <iostream>
using namespace std;
  int reverse(int a){
    int revx=0;
    while(a!=0){
        revx*=10;
        revx+=a%10;
        a/=10;
    }
    return revx;
  }

int main() {
    for(int i=0;i<=256;i++)
      if(i*i==reverse(i*i))
        printf("%d\n",i);
}