package main

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

type FastScanner struct {
	r *bufio.Reader
}

func NewFastScanner() *FastScanner {
	return &FastScanner{r: bufio.NewReaderSize(os.Stdin, 1<<20)}
}

func (fs *FastScanner) NextInt() int {
	sign, val := 1, 0
	c, err := fs.r.ReadByte()
	for (c < '0' || c > '9') && c != '-' {
		c, err = fs.r.ReadByte()
		if err != nil {
			return 0
		}
	}
	if c == '-' {
		sign = -1
		c, _ = fs.r.ReadByte()
	}
	for c >= '0' && c <= '9' {
		val = val*10 + int(c-'0')
		c, err = fs.r.ReadByte()
		if err != nil {
			break
		}
	}
	if err == nil {
		_ = fs.r.UnreadByte()
	}
	return sign * val
}

func main() {
	in := NewFastScanner()
	out := bufio.NewWriterSize(os.Stdout, 1<<20)
	defer out.Flush()

	t := in.NextInt()
	for ; t > 0; t-- {
		n := in.NextInt()
		next := make([]int, n+1)
		for i := 1; i <= n; i++ {
			a := in.NextInt()
			next[i] = i - a
		}

		pos := make([]int, n+1)
		path := make([]int, 0, n)
		cur := 1
		step := 1
		for pos[cur] == 0 {
			pos[cur] = step
			path = append(path, cur)
			step++
			cur = next[cur]
		}

		start := pos[cur] - 1
		cycle := path[start:]
		fmt.Fprintln(out, len(cycle))
		for i, v := range cycle {
			if i > 0 {
				out.WriteByte(' ')
			}
			fmt.Fprint(out, v)
		}
		out.WriteByte('\n')
	}
}