(set-info :smt-lib-version 2.5)
(set-logic ALL)
(set-info :status sat)
(set-option :strings-exp true)
(set-option :strings-fmf true)
(set-option :produce-models true)
(declare-fun x () String)
(declare-fun y () String)
(declare-fun z () String)
(assert (not (= x "")))
(assert (not (= y "")))
(assert (not (= (str.replace x y z) (str.replaceall x y z))))
(check-sat)