package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
)

type Participant struct {
	name  string
	score int
}

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var n int
	fmt.Fscan(in, &n)

	a := make([]Participant, n)
	for i := 0; i < n; i++ {
		fmt.Fscan(in, &a[i].name, &a[i].score)
	}

	sort.Slice(a, func(i, j int) bool {
		if a[i].score != a[j].score {
			return a[i].score > a[j].score
		}
		return a[i].name < a[j].name
	})

	pos := 1
	for i := 0; i < n; {
		j := i
		for j < n && a[j].score == a[i].score {
			j++
		}
		m := j - i
		place := strconv.Itoa(pos)
		if m > 1 {
			place = fmt.Sprintf("%d-%d", pos, pos+m-1)
		}
		for k := i; k < j; k++ {
			fmt.Fprintf(out, "%s %s\n", place, a[k].name)
		}
		pos += m
		i = j
	}
}