get random image from firebase-realtime-database child

Question

        reference = FirebaseDatabase.getInstance().getReference().child("ADS");



 @Override
            public void onDataChange(@NonNull @NotNull DataSnapshot snapshot) {
                progressBar.setVisibility(View.GONE);
list= new ArrayList<>();
for (DataSnapshot shot : snapshot.getChildren()){
    String data = shot.getValue().toString();
    

• Database structure

I want to randomly get data from ADS.