[Slakah]

Do you have errors enabled because if you copied and pasted that code then there are some glaring errors i.e.

MYTABLE = {"A","B","C")

should be

MYTABLE = {"A","B","C"}

and if you want it to output "ABC" then this:

for val in pairs(MYTABLE) do MYSTRING = MYSTRING .. val end

should be

for i, val in pairs(MYTABLE) do
   MYSTRING = MYSTRING .. val
end