Split into the individual messages, then take the most common bit in each positition over all messages.
code here: [https://github.com/blatchley/CTF_Writeups/blob/master/2020/NACTF/crypto/CryptoWriteups.md#error-0](https://github.com/blatchley/CTF_Writeups/blob/master/2020/NACTF/crypto/CryptoWriteups.md#error-0)