Read one line, XOR every byte with 0x42, print the result base64-encoded.
Quick obfuscation trick used in Black Hat Python: XOR your payload with a constant byte and base64-encode it so it survives copy/paste.
Read ONE line of plaintext from stdin. XOR each byte with `0x42`, then base64-encode the resulting bytes. Print the base64 string.
Test: input `ping` → output `MissJQ==`.
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