return elements from List considering an alphabet rule

So I'm trying to build a function that receives as a parameter a List of 5 elements, this list is of the string type, and the result that I'm after follows this logic:

List:

List<string> lista= new List<string>();

            lista.Add("Movel");
            lista.Add("ONU");
            lista.Add("Pata");
            lista.Add("Tela");
            lista.Add("Plasticos");

I need to return only the elements where the last letter is superior to the first following alphabetical order, in this case, only "ONU" and "Plasticos" would be ret开发者_StackOverflow中文版urned.

I'm rather new to C#, in fact, I'm just new to programming overall, but in the small knowledge I've accumulated, I honestly don't know where to go with this, any help would be grand.

Theres probably regex ways you can do this or something, but you can probably do this with a Linq expression of some sort e.g.

IEnumerable<string> temp = from str in lista
                       let last = str.ToLower().Last()
                       let first = str.ToLower().First()
                       where last > first
                       select str;

Would give you the answers you seek I think, but that's probably a pretty inefficient way to do it if you need a quick algorithm.

return lista.Where(s => { s = s.ToLower(); return s[0] < s[s.Length-1] });

Try:

List<string> listb = lista.FindAll(s => String.Compare(s.Substring(s.Length - 1), s.Substring(0, 1)) == 1).ToList();

I could come up with this

List<string> filtered = lista.FindAll(s => char.ToLowerInvariant(s[s.Length - 1]) > char.ToLowerInvariant(s[0])).ToList();

My result:

var result = lista.Where(x => x.ToLower()[0] < x.ToLower()[x.Length - 1]).ToList();