Error in getting top 10 biggest table

Hi ,

I am executing below query to get top 10 biggest size table but getting
error

SELECT table_name,pg_relation_size(table_schema || '.' || table_name) as
size FROM information_schema.tables WHERE table_schema NOT IN
('information_schema', 'pg_catalog') ORDER BY size DESC LIMIT 10;

*ERROR: relation "public.contacts" does not exist*

*Original Table : Contacts*

It seems problem is with CAPS letter in Postgres table .

So any possibilities to execute this Caps letter table without any error