That should be a, not A. A will remove trailing 0x20 bytes.
S might be correct even on big-endian machines.
- Use S for native endianness.
- Use S< or v for little-endian.
- Use S> or n for big-endian.
If the OP was using a little-endian machine, we can only rule out the last one from the info provided.
See Mini-Tutorial: Formats for Packing and Unpacking Numbers for a convenient table of pack/unpack numeric formats.
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