After the independence of Pakistan, Prime Minister Liaquat Ali Khan launched the Personal Identity System (PIS) program to issue national identification cards to the citizens of Pakistan and Muslim refugees settling in Pakistan. Since the 1960s, Pakistan has been issuing National Identity Card (commonly known by the acronym, NIC) numbers to its citizens. These numbers are assigned at birth when the parents complete the child's birth registration form (B-Form), and then a National Identity Card (NIC) with the same number is issued at the age of 18. Until, 2001 NIC numbers were 11 digits long. In 2001–2002, the National Database and Registration Authority (NADRA), started issuing 13-digit NIC numbers along with their new biometric ID cards. The first 5 digits are based on the applicant's locality, the next 7 are serial numbers, and the last digit is a check digit. The last digit also indicates the gender of the applicant; an even number indicates a female and an odd number indicates a male. The old numbers are invalid as of 2004.