// A string version of CharacterArray.cc

#include <iostream>
#include <string>
using namespace std;

void PrintExtensionNumber(string s);

int main()
{
   string surname;
   string phone;
   string subject = "Information Engineering";

   // Get user details
   cout <<  "Enter surname and telephone number: " << endl;
   cin  >>  surname >> phone;

   cout <<  surname << " is a student of " << subject << endl;

   // If first two digits are 3 then it is a university number.
   if( phone[0]=='3' and phone[1]=='3') 
   {
      cout <<  "Please contact on university extension ";
      PrintExtensionNumber(phone);  
   }
   else 
   {
      cout <<  "Please contact on external number 9-" << phone[0];
      PrintExtensionNumber(phone);
   }
      
   return 0;
}

// Function to print out extension number. Ignores first digit.
void PrintExtensionNumber(string phoneNumber)
{   
  for(int i=1; i<phoneNumber.length(); i++)
   {
     cout << phoneNumber[i];
   }
   cout << endl;
}