Isnt that catchy?ĬONAN: From the death of Mr. FRANK OZ (Actor): (As Lefty) And would you like to buy an O, round and neat, a nearly but circle, tidy and complete? You can sing a pretty song were it like so, O, O, O. What was Lefty, the letter salesman, selling? The award-winning and much beloved series taught countless kids to count, recite their ABCs, and some contend exposed them to some pretty subversive stuff down on the street. This week we mark 40 years since PBS and the Childrens Television Workshop invited us onto Sesame Street.