How gmx RMS read the input of group selection

GROMACS version: 2024
GROMACS modification: No
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I have a groupname starting with a number ‘8NU’ at the index 20 of the group index.
But when I entered 8NU, gmx RMS only read 8 and select the group index 8 as Protein-H.
How can I select the whole 8NU instead of entering 20.
Thank you very much.

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