m=int(input("路段数量: "))

s=input("坑的坐标依次为:").split(',')  #实现字符串“3,4,6”，转化为列表["3","4","6"]

n=len(s)

for i in range(n) :

    s[i]=int(s[i])

flag=[False]*(n-1)

for i in range(1,m) :

    k=-1

    for j in range(n-1) :

        if :

            if k==-1 or s[j+1]-s[j]>s[k+1]-s[k]:

                k=j

    flag[k]=True

print("维修管制的路段依次为:")

dis,t=0,0

for i in range(n-1):

    if flag[i]:

        print(s[t],"~",s[i])

        dis+=s[i]-s[t]+1

print(s[t],"~",s[n-1])

dis=

print("管制总长度为",dis)