VK API "wall-" (two type link)

He needs to know how to recognize two types of links to the pictures on the wall (of the group)
VK API ?



or

vk.com/photo-XXXX_XXXX

(not all of the links work)[acess denied]
but this type of work links

vk.com/wall-XXXX?z=photo-XXXX_XXXX%2Fwall-XXXX_XXXX

Only example:

vk.com/wall-35680595?z=photo-35680595_349943446%2wall-35680595_56742 (Work)

vk.com/photo-35680595_349943446 (Not work)