output_description: Print the ID numbers for all the cities, in ascending order of indices (City
  1, City 2, ...).
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      N M
      P_1 Y_1
      :
      P_M Y_M
attempt: n,m=map(int,input().split())
  py=[]
  for i in range(m):
      py.append(list(map(int,input().split()))+[i+1])
  py.sort()
  number_list=[]
  number_list.append([str(0)]*(6-(len(list(str(py[0][0])))))+list(str(py[0][0]))+[str(0)]*(6-(len(list(str(1)))))+list(str(1))+[str(py[0][-1])])
  k=2
  for j in range(1,m):
      if py[j][0]==py[j-1][0]:
          number_list.append([str(0)]*(6-(len(list(str(py[j][0])))))+list(str(py[j][0]))+[str(0)]*(6-(len(list(str(k)))))+list(str(k))+[str(py[j][-1])])    
          k+=1
      else:
          k=1
          number_list.append([str(0)]*(6-(len(list(str(py[j][0])))))+list(str(py[j][0]))+[str(0)]*(6-(len(list(str(k)))))+list(str(k))+[str(py[j][-1])])
          k+=1
  number_list_sort=sorted(number_list,key=lambda x:x[-1])
  for l in range(m):
      print(''.join(number_list_sort[l][:-1])
problem_description: Statement
  
  In Republic of Atcoder, there are N prefectures, and a total of M cities that
  belong to those prefectures.
  
  City i is established in year Y_i and belongs to Prefecture P_i.
  
  You can assume that there are no multiple cities that are established in the
  same year.
  
  It is decided to allocate a 12-digit ID number to each city.
  
  If City i is the x-th established city among the cities that belong to
  Prefecture i, the first six digits of the ID number of City i is P_i, and the
  last six digits of the ID number is x.
  
  Here, if P_i or x (or both) has less than six digits, zeros are added to the
  left until it has six digits.
  
  Find the ID numbers for all the cities.
  
  Note that there can be a prefecture with no cities.
samples: [{"input": "2 3\n    1 32\n    2 63\n    1 12", "output": "000001000002\n    000002000001\n    000001000001\n    \n\n  * As City 1 is the second established city among the cities that belong to Prefecture 1, its ID number is 000001000002.\n  * As City 2 is the first established city among the cities that belong to Prefecture 2, its ID number is 000002000001.\n  * As City 3 is the first established city among the cities that belong to Prefecture 1, its ID number is 000001000001.\n\n* * *"}, {"input": "2 3\n    2 55\n    2 77\n    2 99", "output": "000002000001\n    000002000002\n    000002000003"}]