#include<bits/stdc++.h>
using namespace std;
int main()
{
	int i,n=0,a=0,b=0,c=0,d=0;
	for(i=1000;i<=9999;i++){
		a=i/1000;
		b=i%1000/100;
		c=i%100/10;
		d=i%10;
		n=sqrt(i);
		if((a==b)&&(c==d)&&(b!=c)&&(n*n==i))
		cout<<i<<endl;
	}
	return 0;
}
/**************************************************************
	Problem: 1092
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/