SELECT t1.lname FROM authors AS t1 JOIN authorship AS t2 ON t1.authid  =  t2.authid JOIN papers AS t3 ON t2.paperid  =  t3.paperid WHERE t3.title LIKE "%Monadic%"
Find the last names of all the authors that have written a paper with title containing the word "Monadic".
[Schema (values) (types)]: | icfp_1 |  Inst : instid (text) , name (number) , country (text) | Authors : authid (text) , lname (number) , fname (text) | Papers : paperid (text) , title (number) | Authorship : authid (text) , instid (number) , paperid (text) , authorder (text);