#!/bin/bash

make_chapters() {

   index=0
   input=()

   for i
   do
      input[$index]="${i%.*}"
      ((index++))
   done

   chapters=()
   index=1

   chapters[$index]=${input[$((index-1))]}

   for ((i=1;i<${#input[@]};i++))
   do
      if (( ${input[$i]} > "${chapters[$index]##* }" ))
      then
         chapters[$index]="${chapters[$index]} ${input[$i]}"
      else
         ((index++))
         chapters[$index]="${input[$i]}"
      fi
   done

   printf "${chapters[1]}\n${chapters[2]}\n"
}

make_chapters "$@"

#Example:
#[%] ./script 30 33.993 76.123 0.6 43.234 87.234 130.345
#30 33 76
#0 43 87 130