type this in your script:
function A = stringorder(A)
if upper(curr) > upper(next)
and save it in stringorder.m .
then you have to put the variable in argument of your function:
f = ["Benn" ; "Dan" ; "Lebron" ; "Jim" ; "Rose"];
F_output = stringorder(f)
also you don't have to use disp(A) at end. the output of function will be printed if you don't use ; .