#Exer. 4.2 from "A primer on..."
import sys

F = sys.argv[1]
F = float(F)

C = (F-32)*5.0/9
print(f'{F} degrees F is {C:.2f} degrees C')

"""
Terminal> python f2c_cml.py 67
67.0 degrees F is 19.44 degrees C
"""