#include <bits/stdc++.h>
using namespace std;
int main(){
	int y=31;
	for(;y*y<=9999;y++){
		int u=y*y;
		if(u/1000==u/100%10&&u/10%10==u%10)cout<<u<<"\n";
	}
	return 0;
}

/**************************************************************
	Problem: 1092
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:3 ms
	Memory:2072 kb
****************************************************************/