package main

import (
	"fmt"
	"strings"
)

func removeKdigits(num string , k int) string {
	numList := make([]rune,0)
	leftPosit := len(num) - k
	for i , v := range num {
		for k >0 && i >0 && len(numList) >0 && numList[len(numList)-1] > v {
			numList = numList[:len(numList)-1]
			k --
		}
		numList = append(numList, v)
	}
	tmpStr := string(numList)[:leftPosit]
	res := strings.TrimLeft(tmpStr,"0")
	if len(res) == 0 {
		return "0"
	}
	return res
}

func min(a , b int) int {
	if a > b {
		return b
	}
	return a
}

func main() {
	fmt.Println(removeKdigits("1234567890" , 9 ))
}