Shell Script to find biggest of two numbers

Program

#! /bin/bash
echo "Enter first number"
read a
echo "Enter second number"
read b
if [ $a -gt $b ]
then
	echo $a "is greater"
else
	echo $b "is greater"
fi

Output

$ chmod 755 biggest-of-two-numbers.sh
$ sh biggest-of-two-numbers.sh
Enter first number
98
Enter second number
12
98 is greater