package main

import (
	"bufio"
	"fmt"
	"os"
)

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

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

	for tc := 0; tc < t; tc++ {
		var n int
		var s string
		fmt.Fscan(in, &n, &s)

		sorted := true
		for i := 1; i < n; i++ {
			if s[i-1] > s[i] {
				sorted = false
				break
			}
		}

		if sorted {
			fmt.Fprintln(out, 0)
			continue
		}

		zeros := 0
		for i := 0; i < n; i++ {
			if s[i] == '0' {
				zeros++
			}
		}

		var ans []int
		for i := 0; i < n; i++ {
			if i < zeros && s[i] == '1' {
				ans = append(ans, i+1)
			} else if i >= zeros && s[i] == '0' {
				ans = append(ans, i+1)
			}
		}

		fmt.Fprintln(out, 1)
		fmt.Fprint(out, len(ans))
		for _, v := range ans {
			fmt.Fprint(out, " ", v)
		}
		fmt.Fprintln(out)
	}
}