A telephone number has the form ABC-DEF-GHIJ, where each letter represents a different digit.
The digits in each part of the number are in decreasing order; that is, A > B > C,
D > E > F, and G > H > I > J.
Furthermore, D, E, and F are consecutive even digits; G, H, I, and J are consecutive odd digits;
and A + B + C = 9.
What is the telephone number?
Justify your answer.