That's a blast from the past. While I did have a reason to know Ada that was over 2 decades ago. Unless your job depends on it, I'd supply a little more about what you want to write, if it has a GUI or is it Web based and more.
Oh am already writing with C# , C++ ,java and little Python .. i just wanna do this for fun and knowing new language .. i found Compiler called AdaGuide but am stuck within , i think because it's not fimiliar
FWIW, the Oracle embedded PL/SQL software is a derivative of Ada. It (Ada) was developed by the US Government - our tax dollars at work! The Gnu Ada compiler is probably the best bet - available on Source Forge, it has versions for most every operating system. Here is a link: https://sourceforge.net/projects/gnuada/
Most linux systems have Ada in their standard repositories. It is called gcc-gnat, and there is a GUI front end for it as well called GtkAda.