# Write a function that takes a secret int code as input.
# The function
#  - uses a dct (a dictionary outside function),
#  - counts the number of values whose
#    sums equal to the secret int code.
# If no sum of the values in the dictionary equals to
# the secret int code, return None

# Example:
#  if a dictionary is {'A':[0,1], 'B':[2,3], 'C':[4,5], 'D':[1,4]}
#     and the secret int code is 5
#     the function returns 2
#  if a dictionary is {'A':[0,1], 'B':[2,3], 'C':[4,5], 'D':[1,4]}
#     and the secret int code is 15
#     the function returns None

# You may not use sum(list_of_int) built-in function


def count_sum(secret):








dct = {'A': [0, 1], 'B': [2, 3], 'C': [4, 5], 'D': [1, 4]}

print(count_sum(5))
print(count_sum(15))


# Thought questions:
#   What are differences between e2-recap-2.py and e2-recap-3.py?
#   Review "passing by reference" and "tracing code"