NameError. Please Help

[yusifahmadov]

import sqlite3
con=sqlite3.connect("contactbook.db")
cursor=con.cursor()

def add_contact(group,first_name,last_name,title,mobile):
	cursor.execute("CREATE TABLE IF NOT EXISTS contacts (group TEXT, first_name TEXT, last_name TEXT, title TEXT , mobile INT)")
	con.commit()
	cursor.execute("INSERT INTO contacts VALUES(?,?,?,?,?)",(group,first_name,last_name,title,mobile))
	con.commit()
	group=input("Group:")
	first_name=input("First Name:")
	last_name=input("Last Name:")
	title=input("Title:")
	mobile=int(input("Mobile:"))
	con.close()
def menu():
	try:
		ch1=int(input("[1] - All Contacts\n[2] - Add Contact\n[3] - Edit Contact\n\nChoose One:"))
		if ch1==1:
			all_contacts()
		if ch1==2:
			add_contact(group, first_name, last_name, title, mobile)
		if ch1==3:
			edit_contact()
	except ValueError:
		print("Wrong Format!")


menu()

Error:
[1] - All Contacts
[2] - Add Contact
[3] - Edit Contact

Choose One:2
Traceback (most recent call last):
  File "asdasdasdasdasd.py", line 29, in <module>
    menu()
  File "asdasdasdasdasd.py", line 22, in menu
    add_contact(group, first_name, last_name, title, mobile)
NameError: name 'group' is not defined