#!/bin/bash
FILES=/var/www/sushituesday.club/public_html/box/books/animation/*.jpg
for f in $FILES
do
  if [ ${#f} -ge 140 ]; then
    convert $f ${f: -7:-4}.pdf
elif [ ${f: -6:-5} == "0" ]; then
    convert $f ${f: -5:-4}.pdf
else
   convert $f ${f: -6:-4}.pdf 
  fi
done