using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        List<string> inputs = new(){

            "4193 with words",

            "12xx34"

        };

        foreach( var item in inputs )

            Console.WriteLine("{0} => {1}", item, Transform(item));

    }

    public static int Transform(ReadOnlySpan<char> input)

    {

        int result = 0;

        foreach( char c in input )

        {

            if(char.IsDigit(c))

            {

                result *= 10;

                result += (int)c - '0';

            }

        }

        return result;

    }

}