What will be the result of the launch of this code?

package tutorial.base;

public class TypesTutorial {
    public static void main(String... args) {
        A alpha = new B(0);
    }
}

class A {
    A(int x){            // - 1 -
        a(x);            // - 2 -
    }
    
    void a(int x) {
        System.out.println("A-a: " + x);
    }
}

class B extends A {
    B(int x) {           // - 3 -
        a(x);            // - 4 -
    }
    
    void a(int x) {
        System.out.println("B-a: " + x);
    }
}
Explanation
In class A there are no default constructor, so the constructor of the class B (child) should firstly explicitly call one of the advertised constructors of the parent class.

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