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With perl, without any shell pipes (quicker) :
$ perl -lne '/\d+(?:-)/ and $h{$&}++;END{print scalar keys %h}' file
$ perl -lne '/\d+-/ and $h{$&}++;END{print scalar keys %h}' file
$ perl -lne '/\d+/ and $h{$&}++;END{print scalar keys %h}' file
$ perl -lne '/^\w+\K\d+\d+/ and $h{$&}++;END{print scalar keys %h}' file
With perl :
$ perl -lne '/^\w+\K\d+/ and $h{$&}++;END{print scalar keys %h}' file
