Update Record Id of one object to another Object using custom functions

Update Record Id of one object to another Object using custom functions

Hi,

I have an object A which has a lookup to object B. Whenever Object B is created I want to get the ID of the record that is created and update that record ID to the lookup present in the object A. Using Custom function based on the phone no criteria I used the integration task SearchRecordbyPDC to fetch the records. From the list return I am not able to pick the particular field value from the list. How can I do it? Is there any other way? Am I doing right?
  1. resp1 = zoho.crm.searchRecordsByPDC("CustomModule3" ,"phone" ,input.phone) ; 
How do I fetch Id from the above list returned?