How to wait until first function will done? [dupli

Question

This question already has an answer here:

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I have two functions.The first function takes 2 seconds. Second function must wait until the second will finish. This is my following code.

     void Update(){

      StartCoroutine("something");

        }

     IEnumerator something()
        {
           First();
           yield return null;
             Second();

        }
        void First(){
                      for(long i=0;i<2131232123123123;i++){
                          print(i);
}
        }
        void Second(){print("Done");}