input = input[:index] + chr(char) + input[index:]
坚持在发展中保障和改善民生，始终把推动高质量发展放在首位；
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In this case, the code I thought was complex – the crypto, Merkle trees, and protocol gymnastics – was fine. It was the “trivial” line that killed performance.
What AIO Actually Means and Why It Matters