接棒者的挑战虽然刘建军行长奠定了一份坚实的家底，但邮储银行未来的难题仍不少，也是接棒者面临的考验。
What is the current membership of the Board of Directors?
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res[i] = stack.length ? stack.at(-1) : -1;
Number (4): Everything in this space must add up to 4. The answer is 4-0, placed horizontally.