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 odd digits. $G$, $H$, $I$, and $J$ are consecutive even digits. $A+B+C=18$. Find $A$.