/* 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) {
    	String str = "aab";
    	String spl[] = str.replace("ab", "a-b").split("-");
    	boolean check = spl[0].matches("a+") && spl[1].matches("b+") 
    					&& spl[0].length() == 2 * spl[1].length();
    	System.out.println(check ? "CORRECT" : "NOT CORRECT");
	}
}

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