def f(n):
    global N,saras,val

    if n-1 in res[n-1]:
        a=val[n-2]+saras[n]
        b=val[n-1]
        if a<=b:
            res[n]=res[n-1][:]
            val[n]=val[n-1]
        else:
            res[n]=res[n-2][:]
            res[n].append(n)
            val[n]=val[n-2]+saras[n]
    else:
        res[n]=res[n-2][:]
        res[n].append(n)
        val[n]=val[n-2]

    return

N=int(input())
#saras=[1,2,3,4]
saras=input()

ss=saras.split(" ")

saras=list(map(int,saras.split(" ")))

val=[False]*N
val[0]=1
val[1]=2

res=[[]for i in range(N)]
res[0]=[0]
res[1]=[saras[0:2].index(max(saras[0],saras[1]))]

for n in range(2,N):
    f(n)

#print(val)
#print(res)
print(val[N-1])
hoge=list(map(lambda x:x+1,res[N-1]))
print(" ".join(map(str,hoge)))