import pytz

all_tz = set(pytz.all_timezones)
common_tz = set(pytz.common_timezones)

print("Number of All Timezones: {}\nNumber of Common Timzones: {}\n".format(len(all_tz), len(common_tz)))

diff_tz = all_tz - common_tz

print("Uncommon Timezones:")
for x in sorted(diff_tz):
    print(x)