apex access list first element data

List<List<SObject>> searchList = [FIND 'rose' IN ALL FIELDS RETURNING Account(Name), Contact(FirstName,LastName,Department)];
System.debug('searchList===> '+searchList[1]);
Contact [] searchedInvoice = (List<Contact>)searchList[1];
Contact con = ((List<Contact>)searchedInvoice)[0];
System.debug('searchedInvoice===> '+((List<Contact>)searchedInvoice)[0]);
System.debug('con===> '+con.firstName);