/* 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
	{
Random r = new Random();
StringBuilder res = new StringBuilder();
for (int i = 0; i < 3; i++) {
     res.append((char)(r.nextInt(26) + 'a'));
}
for (int j = 0; j < 2; j++) {
    res.append(r.nextInt(10)); // You could use the same trick with '0'
}
System.out.println(res);
}
}

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