weight = int(raw_input("How many grams does the object weight? "))
if weight >1000:
    print "It weighs " + str(weight/1000.0) + " kilograms."
elif weight > 100:
    print "It weighs " + str(weight/100.0) + " hectograms."
elif weight > 10:
    print "It weighs " + str(weight/10.0) + " dekagrams."
elif weight >= 0:
    print "It weighs " + str(weight) + " grams."
else:
    print "You entered an invalid number."