Howdy Arun,
I am glad you have found a solution to your problem.
An alternative way to handle strings and values is to wrap the string with a
val() statement like so :
val("1")
or
val(Keyword)
If the string cannot be converted to a value using this method an error will occur. Combining your expression with an error handler allows you to determine what happens if an error occurs. You can download the training material for error handlers
here
Good Luck!