22222222222222222222222222222222222222「建议收藏」

import sys

list1 = sys.stdin.readline().strip().split(",")
list2= [int(x) for x in list1]
if len(list2)==2:
    print(sum(list2))
else:
    if min(list2)>=0:
        print(min(list2)+min(list2[list2.index(min(list2))+1:]+list2[:list2.index(min(list2))]))
    else:
        result1=min(list2)
        p=q=list2.index(min(list2))
        while(p>0):
            if list2[p]>0:
                break
            p-=1
        while (q < len(list2)-1):
            if list2[q] > 0:
                break
            q += 1
        result1=sum(list2[p+1:q])
        temp = list2[:p] + list2[q:]
        if p==0 and list2[p]<0:
            result1+=list2[0]
            temp.pop(0)
        if q==len(list2)-1 and list2[q]<0:
            result1+=list2[q]
            if temp!=[]:
                temp.pop(-1)
        if len(temp)==0:
            print(result1)
        else:
            if min(temp)>0:
                print(result1)
            else:
                print(temp)
                r=s=temp.index(min(temp))
                while (s > 0):

                    if temp[s] > 0:
                        break
                    s -= 1
                while (r < len(temp)-1):

                    if temp[r] > 0:
                        break
                    r += 1
                result2=sum(temp[s+1:r])
                print(s,r)
                if s == 0 and temp[s] < 0:
                    result2 += temp[0]
                if r == len(temp) - 1 and temp[r] < 0:
                    result2 += temp[r]
                print(result1+result2)

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