@Array_1 = ("a1","a2","a3","a4","a5","a6");
@Array_2 = ("a1","b2","c3","a4","f5","a6");
@Array_3 = ("1","2","3","4","5","6");

output

@Array_2 = ("a1","a4","a6");
@Array_3 = ("1","4","6");