# 题目¶

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## 2017 Tokyo Westerns CTF 3rd Backpacker's Problem¶

Given the integers a_1, a_2, ..., a_N, your task is to find a subsequence b of a
where b_1 + b_2 + ... + b_K = 0.

Input Format: N a_1 a_2 ... a_N
Answer Format: K b_1 b_2 ... b_K

Example Input:
4 -8 -2 3 5