Python - Calculating the Redshift Value

Python program that calculates a redshift value. Attached and below.

print ("Calculate the redshift of a star or galaxy using the change in wavelength.")
answer = "y"

# Start while loop
while (answer == "y"):
    # Observed wavelength entered by user and converted to an integer
    observedWavelength = int(input("Enter the observed wavelength in Angstroms: "))
    
    # Wavelength of element entered by user and converted to an integer
    elementWavelength = int(input("Enter the element's wavelength in Angstroms: "))

    # Calculate the change or shift in the wavelength
    changeWavelength = observedWavelength - elementWavelength
    print ("The formula is: redshift = (change in wavelength/wavelength of the element)")
    redshift = (changeWavelength/elementWavelength)
    print ("The redhshift of the star or galaxy is:", redshift)
    print ("Note that a positive value means the object is moving away from Earth.")
    print ("A negative value means that the object is moving towards Earth.")
    answer = input("Would you like to do another calculation? (y/n) ")
# End while loop

print ("Thank you to Professor Morgan at the University of Northern Iowa for the formula and explanation.")