package main

import (
	"bufio"
	"fmt"
	"io"
	"math"
	"os"
	"sort"
	"strconv"
	"strings"

)


func main() {
	solve(os.Stdin, os.Stdout)
}

type ReaderEx struct {
	baseScanner *bufio.Scanner
	words       []string
	nextWordIdx func() int
	initWordIdx func(int)
}

func NewScannerEx(stdin io.Reader) *ReaderEx {
	var this ReaderEx
	var idx int
	var wordsCnt int
	this.baseScanner = bufio.NewScanner(stdin)
	this.baseScanner.Buffer(make([]byte, 0), 1E+11)
	this.nextWordIdx = func() int {
		cur := idx
		idx = (idx + 1) % wordsCnt
		return cur
	}
	this.initWordIdx = func(wc int) {
		idx = 0
		wordsCnt = wc
	}
	return &this
}

func (me *ReaderEx) Scan(doSplit bool) (isScanned bool) {
	isScanned = me.baseScanner.Scan()
	if doSplit {
		me.words = strings.Fields(me.baseScanner.Text())
	} else {
		me.words = []string{me.baseScanner.Text()}
	}
	me.initWordIdx(len(me.words))
	return
}

func (me *ReaderEx) nextBytes() []byte {
	return []byte(me.words[me.nextWordIdx()])
}
func (me *ReaderEx) nextString() string {
	return me.words[me.nextWordIdx()]
}

type StringArray []string

func (me *ReaderEx) nextStringArray() StringArray {
	return me.words[me.nextWordIdx():]
}

func (me StringArray) toStrings() []string {
	return me
}

func (me StringArray) toInts() []int {
	strValues := me.toStrings()
	values := make([]int, len(strValues))
	for i, v := range strValues {
		n, err := strconv.Atoi(v)
		if err != nil {
			panic(err)
		}
		values[i] = n
	}
	return values
}
func (me *ReaderEx) nextInt() int {
	n, err := strconv.Atoi(me.words[me.nextWordIdx()])

	defer func() {
		if err != nil {
			panic(fmt.Sprintf("getInt(%d)", n))
		}
	}()
	return n
}

func pow(x, y, mod int) (ans int) {

	ans = 1
	for bit := 1 << uint(math.Floor(math.Log2(float64(y)))); ; bit >>= 1 {
		if y&bit != 0 {
			ans *= x
			if mod > 0 {
				ans %= mod
			}
		}
		if bit <= 1 {
			return
		}
		ans *= ans
		if mod > 0 {
			ans %= mod
		}
	}
}

type factType struct {
	prime int
	count int
}

func fact(n int) (facts []*factType) {

	for i := 2; i*i <= n; i++ {
		if n%i == 0 {
			fa := factType{prime: i}
			for n%fa.prime == 0 {
				n /= fa.prime
				fa.count++
			}
			facts = append(facts, &fa)
		}
	}
	if n > 1 {
		facts = append(facts, &factType{prime: n, count: 1})
	}
	return facts
}
func dec2bin(n int) (ret []bool) {
	for bit := 1 << uint(math.Floor(math.Log2(float64(n)))); ; bit >>= 1 {
		ret = append(ret, n&bit != 0)

		if bit <= 1 {
			return
		}
	}

}

func abs(v int) int {
	if v < 0 {
		v = -v
	}
	return v
}

func b2i(b bool) (i int) {
	if b {
		i = 1
	} else {
		i = 0
	}
	return
}

type PY struct {
	pKen  int
	yNen  int
	id    int
	newID int
}
type PYRekiSorter []PY

func (a PYRekiSorter) Len() int      { return len(a) }
func (a PYRekiSorter) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
func (a PYRekiSorter) Less(i, j int) bool {
	switch {
	case a[i].pKen < a[j].pKen:
		return true
	case a[i].pKen > a[j].pKen:
		return false
	case a[i].yNen < a[j].yNen:
		return true
	default:
		return false
	}
}

type PYIDSorter []PY

func (a PYIDSorter) Len() int           { return len(a) }
func (a PYIDSorter) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
func (a PYIDSorter) Less(i, j int) bool { return a[i].id < a[j].id }

func solve(stdin io.Reader, stdout io.Writer) {

	r := NewScannerEx(stdin)
	r.Scan(true)
	_, m := r.nextInt(), r.nextInt()

	py := make([]PY, m)
	for i := 0; i < m; i++ {
		r.Scan(true)
		py[i] = PY{id: i, pKen: r.nextInt(), yNen: r.nextInt()}
	}

	sort.Sort(PYRekiSorter(py))

	createID := func(src []PY) []PY {
		wid := -1
		newID := 0
		for i := range src {
			value := &src[i]
			if value.pKen != wid {
				wid = value.pKen
				newID = 1
			}
			value.newID = newID
			newID++
		}
		return src
	}
	createID(py)

	sort.Sort(PYIDSorter(py))

	for _, v := range py {
		fmt.Fprintf(stdout, "%06d%06d\n", v.pKen, v.newID)
	}
}


Measured memory_bytes: 8576