Write an expression so that "User is $18"$ is printed if the value of user$\_$age is equal to $18.$ Write only the expression.

Ex: If the input is $18,$ then the output is:

User is $18$

Ex: If the input is $30,$ then the output is:

Not $18$

Note: Replace $\text{'}\text{'}\text{'}$ Your solution goes here $\text{'}\text{'}\text{'}($including quotes$)$ with your solution.