Reverse of a string in UNIX

#!/bin/ksh

############################

# This program accepts a string a prints the reverse of it without using any inbuilt function.

############################

#Print the input string
echo $1;


STRINGLEN=`echo $1 | wc -c`

for i in `seq 0 $LEN`
do
  INDEX=$(( $STRINGLEN - ($i + 1) ))
  C=`echo $1 | cut -c $INDEX`
  echo $C
done