For problem statement at 0-999/500-599/590-599/599/problemB.txt this is a correct solution, but verifier at 0-999/500-599/590-599/599/verifierB.go ends with All 100 tests passed can you fix the verifier? package main

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

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

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

	n := in.NextInt()
	m := in.NextInt()

	cnt := make([]int, n+1)
	pre := make([]int, n+1)

	for i := 1; i <= n; i++ {
		x := in.NextInt()
		if cnt[x] == 0 {
			pre[x] = i
		}
		cnt[x]++
	}

	ans := make([]int, m)
	amb := false

	for i := 0; i < m; i++ {
		b := in.NextInt()
		if cnt[b] == 0 {
			fmt.Fprint(out, "Impossible")
			return
		}
		if cnt[b] > 1 {
			amb = true
		}
		ans[i] = pre[b]
	}

	if amb {
		fmt.Fprint(out, "Ambiguity")
		return
	}

	fmt.Fprintln(out, "Possible")
	var sb strings.Builder
	for i, v := range ans {
		if i > 0 {
			sb.WriteByte(' ')
		}
		sb.WriteString(fmt.Sprintf("%d", v))
	}
	fmt.Fprint(out, sb.String())
}