i'm begineer in kotlin n i want to print age program using if else. if am given a alphabet than the print sorry numeric value expected

enter code here

i'm begineer in kotlin n i want to print age program using if else. if am given a alphabet than the print sorry numeric value expected.

 import java.util.*
 //import javax.print.attribute.IntegerSyntax
 fun main(agrs : Array<String>) {
      //var value1  = 11.0fe is $age")
     val input = Scanner(System.`in`)
           println("enter your Age ")
      val a = input.nextInt()
           println("your age is : " + a)