using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Digite su cedula: ");

        string x="";

        string e="";

        x=Console.ReadLine();

        string [] cedula= new string [4] {"123" , "456", "789", "111"};

        string [] nombre= new string [4] {"David", "Keity", " Mario", "profe" };

        for (int i=0; i<cedula.Length; i++)     

        {   

            if ( x==cedula [i])

            {

                Console.WriteLine(nombre[i]);e ="si";

            }   

        }

        if (e != "si")

        {

            Console.WriteLine("La cedula no fue encontrada");

        }       

    }

}