Hello. I need to sorting a list like z=[['111','C'],['234','A'],['12','Z'],['89','V'],['1110009','E'],['5','T']], by the length of the first element and then by his order.

Using z.sort() give [['111', 'C'], ['1110009', 'E'], ['12', 'Z'], ['234', 'A'], ['5', 'T'], ['89', 'V']]. I would to combinate the fuction 'len' but i don't know how to do it.
I try to find the soluce but I don't realy understand how use 'key' or lambda and...