/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2019-2021. All rights reserved.
 * Description: 上機程式設計認證
 * Note: 預設程式碼僅供參考，可自行決定使用、修改或刪除
 * 只能import Go標準庫
 */
package main

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

// 待實現函式，在此函式中填入答題程式碼
func getTop3Num(input string) []int {
   //按規則抽取所有的數字
   //規則1.緊靠數字的-號表示負數
   //規則2.前面的0需要去掉
   //規則3.從大到小排序取前三
   nums := []int{}
   boxString := ""
   boxTagForNegative := -1
   boxTagForIntval := false
   //boxTagForZero := 0
   for key,value := range input {
      if string(value) == "-" {
         boxTagForNegative = key
      }
      if value >=48 && value <= 57 {
         boxTagForIntval = true
      }
      if key - boxTagForNegative == 1 {
         boxString = "-"
         boxTagForNegative = -1
      }
      if boxTagForIntval {
         boxString += string(value)
      }
      if !boxTagForIntval && boxTagForNegative == -1 || key == len(input) - 1{
         boxInt,_  := strconv.Atoi(boxString)
         nums = append(nums,boxInt)
         boxString = ""
      }
      boxTagForIntval = false
   }
   sort.Sort(sort.Reverse(sort.IntSlice(nums)))
   return nums[0:2]
}

func main() {
   inputReader := bufio.NewReader(os.Stdin)
   lineBuf, err := inputReader.ReadString('\n')
   if err != nil && err != io.EOF {
      fmt.Println(err.Error())
      return
   }
   input := strings.TrimRight(lineBuf, "\r\n")
   result := getTop3Num(input)
   fmt.Print("[")
   for i := 0; i < len(result); i++ {
      if i == 0 {
         fmt.Print(strconv.Itoa(result[i]))
      } else {
         fmt.Print(" " + strconv.Itoa(result[i]))
      }
   }
   fmt.Print("]")
}

a56b-6-8()_56!@$-a
提示：輸入字串四個數字 56，-6，-8,56 取最大
[56 56 -6]



--028.300003
提示：抽取 -28,300003
[300003 -28]