C :

#include <stdio.h>
#include <stdlib.h>
int main()
{
	printf("7744");
	return 0;
}
//Author: ITProgrammer

C++ :

#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;
		}
	}
}

Java :

import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		//Scanner sc = new Scanner(System.in);
		for(int i=1000;i<=9999;i++){
			int q=i/1000;
			int b=i/100%10;
			int s=i/10%10;
			int g=i%10;
			if(q==b&&s==g){
				for(int x=1;x<=Math.sqrt(i);x++){
					if(x*x==i){
						System.out.println(i);
					}
				}
			}
		}
	}
}

Python :

def pfs(x):
    for i in range(33, 100):
        if i * i == x:
            return True
    return False


for a in range(1, 10):
    for b in range(0, 10):
        if a != b:
            s = a * 1000 + a * 100 + b * 10 + b
        if pfs(s) is True:
            print(s)