A $$9$$-digit whole number $$\overline{abcdefghi}$$ is formed using digits $$1$$, $$2$$, $$3$$, $$4$$, $$5$$, $$6$$, $$7$$, $$8$$, $$9$$ without repetition. If $$A= \overline{abc}+ \overline{bcd}+ \overline{cde}+ \overline{def}+ \overline{efg}+ \overline{fgh}+ \overline{ghi}$$, find the largest possible value of $$A$$. 
Overseas Competition->Knowledge Point->Number Theory Modules->Place Value and Number Bases->Applying the Principle of Place Value