#! /bin/bash

# example input:  ./inverse -1-2-3- 1 15
# example output: -4-5-6-7-8-9-10-11-12-13-14-15-

a=$1
b=$2
c=$3
inv="-"
for i in `seq $b $c`;
do
  tmp="-"$i"-"
  found=$(gawk -v a=$a -v tmp=$tmp 'BEGIN{print index(a,tmp)}')
  if (($found==0))
  then
      inv=$inv$i"-"
  fi
done
echo $inv