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# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(A):
    # write your code in Python 3.6
    Sum = sum(A)
    minD = float("inf")
    s = 0
    for a in A[:-1]:
        s += a
        minD = min(abs(Sum - 2 * s), minD)
    return minD