# 1417.py

print (string.ascii_letters)
# abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

print (string.ascii_uppercase)
# ABCDEFGHIJKLMNOPQRSTUVWXYZ

print (string.ascii_lowercase)
# abcdefghijklmnopqrstuvwxyz