AtCoder Beginner Contest 113 C - ID

C - ID

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Time limit : 2sec / Memory limit : 1024MB

Score: 300 points

Problem 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 Yi and belongs to Prefecture Pi.

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 Pi, and the last six digits of the ID number is x.

Here, if Pi 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.

Constraints

• 1≤N≤105
• 1≤M≤105
• 1≤Pi≤N
• 1≤Yi≤109
• Yi are all different.
• All values in input are integers.

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Input

Input is given from Standard Input in the following format:

N M
P1 Y1
:
PM YM

Output

Print the ID numbers for all the cities, in ascending order of indices (City 1, City 2, …).

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Sample Input 1

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2 3
1 32
2 63
1 12

Sample Output 1

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000001000002
000002000001
000001000001

• As City 1 is the second established city among the cities that belong to Prefecture 1, its ID number is 000001000002.
• As City 2 is the first established city among the cities that belong to Prefecture 2, its ID number is 000002000001.
• As City 3 is the first established city among the cities that belong to Prefecture 1, its ID number is 000001000001.

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Sample Input 2

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2 3
2 55
2 77
2 99

Sample Output 2

Copy

000002000001
000002000002
000002000003

输出I64d 会错，吐血

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