C :

#include<stdio.h>
#include<math.h>
int main()
{
	int a,b,c,d;
	for(a=1;a<=9;a++)
	{
		for(b=0;b<=9;b++)
		{
			c = a*1000+a*100+b*10+b;
			d = sqrt(c); 
			if(d*d==c)
			{
			if(a==b)
			break;
			printf("%d\n",c);
			}
		}
	}
}

C++ :

#include<stdio.h>
int main()
{
	int a,b,c,d,n,m;
	for(n=33;n*n<=9988;n++)
	{
		m = n*n;
		a = m/1000;
		b = (m-a*1000)/100;
		c = (m-a*1000-b*100)/10;
		d = m%10;
		if(a==b&&c==d&&a!=c) printf("%d\n",m); 
	}
	return 0;
}