package main

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

func main() {
	var sc = bufio.NewScanner(os.Stdin)
	sc.Buffer(make([]byte, 0, 1000_000), 1000_000)

	sc.Scan()
	N, _ := strconv.Atoi(sc.Text())
	A := make([]int, N+1)
	sc.Scan()
	ss := strings.Fields(sc.Text())
	for i := 0; i < N; i++ {
		A[i], _ = strconv.Atoi(ss[i])
	}

	tt := make([]string, A[0])
	i := 0
	A[N] = 0
	n := N
	for j := N; j > 0; j-- {
		for k := 0; k < A[j-1]-A[j]; k++ {
			//fmt.Print(n, " ")
			tt[i] = strconv.Itoa(n)
			i++
		}
		n--
	}
	fmt.Println(strings.Join(tt, " "))
}