Three (two) less for cmd.
perl -nE"$s^=$_}{say length$s" # Switch quotes for bash
perl -nE "\$Z[y///c]}{say$#Z" # Switch quotes for bash
perl -nE"\$Z[y///c]}{say$#Z" # Switch quotes for bash
perl -nE\$Z[y///c]}{say$#Z # cmd specific
1234567890123456789012345
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