#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main(){
    for(int i=1100;i<=9999;i++){
    	if(sqrt(i)==(int)sqrt(i)&&i/1000==i/100%10&&i/10%10==i%10){
    		cout<<i<<endl;
		}
	}
}
/**************************************************************
	Problem: 1092
	User: admin
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/