package main

import (
	"fmt"
)

func main() {
	var n int
	if _, err := fmt.Scan(&n); err != nil {
		return
	}

	var years []int
	expected := 1

	for i := 1; i <= n; i++ {
		var a int
		fmt.Scan(&a)
		if a == expected {
			years = append(years, 2000+i)
			expected++
		}
	}

	if len(years) == 0 {
		fmt.Println(0)
	} else {
		fmt.Println(len(years))
		for i, y := range years {
			if i > 0 {
				fmt.Print(" ")
			}
			fmt.Print(y)
		}
		fmt.Println()
	}
}