F# program to Subtract two numbers

Program

open System
Console.Write("Enter the first number:\t")
let a = Int32.Parse(Console.ReadLine())
Console.Write("Enter the second number:\t")
let b = Int32.Parse(Console.ReadLine())
let difference = a - b
Console.WriteLine("Difference of two numbers is:\t{0}" ,difference)

Output 1

Enter the first number: 66
Enter the second number:        22
Difference of two numbers is:   44

Output 2

Enter the first number: 22
Enter the second number:        44
Difference of two numbers is:   -22