Let \( A(1,2) \) and \( C(-3,-6) \) be two diagonally opposite vertices of a rhombus, whose sides \( AD \) and \( BC \) are parallel to the line \( 7x - y = 14 \). If \( B(\alpha,\beta) \) and \( D(\gamma,\delta) \) are the other two vertices, then \( |\alpha + \beta + \gamma + \delta| \) is equal to:
