def solution(A):
    # write your code in Python 2.7
    LeftSum=0
    RightSum=sum(A)-A[0]

    EquilArray=[]
    N=len(A)

    for i in range(N-1):
        LeftSum+=A[i]
        RightSum-=A[i+1]
        #print LeftSum,RightSum
        if LeftSum==RightSum:
            EquilArray.append(i+1)

    if len(EquilArray)==0:
        return -1
    else:
        return EquilArray

    pass