/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		StringBuilder result = new StringBuilder();
		long limit = System.currentTimeMillis() + 4800;
		for(int i = 1; i > 0 && System.currentTimeMillis() < limit; i++)
		{
			String a = String.valueOf(i);
			String b = String.valueOf((long) i * i);
			if (b.endsWith(a))
			{
				result.append(a).append("\n");
			}
		}
		System.out.println(result);
	}
}

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