Extract number at end of string in C#

Question

Probably over analysing this a little bit but how would stackoverflow suggest is the best way to return an integer that is contained at the end of a string.

Thus far

Answer 1

Obligatory LINQ one-liner

var input = "ABCD1234";
var result = string.Concat(input.ToArray().Reverse().TakeWhile(char.IsNumber).Reverse());