6-12

entries = []
with open("6 - input", 'r') as file:
    lines = file.readlines()
    entry = []
    for line in lines:
        if line != "\n":
            entry.append(line.strip("\n"))
        if line == "\n" or line is lines[-1]:
            entry.sort()
            entries.append(entry)
            entry = []
print(entries)

concatEntries = []
for entry in entries:
    _entry = []
    for person in entry:
        for char in person:
            _entry.append(char)
    concatEntries.append(_entry)

print(concatEntries)

questionsSum = 0
for entry in concatEntries:
    questionsSum += len(set(entry))

print(questionsSum)


# second part
# sum all answers in each group that is equal to num of people

alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']


numOfYesByAll = 0
for entry in entries:   #   Check each group

    concatAnswer = []   #   Concat all answers in group to count occurences of chars
    for answer in entry:
        for char in answer:
            concatAnswer.append(char)
    concatAnswer.sort() #   Sort the string with all answers, because why not

    yesByAll = []
    numPeople = len(entry)

    print(f"Checking group of {numPeople} people, with answers:\n{concatAnswer}")
    for char in alphabet:
        if concatAnswer.count(char) == numPeople:
            print(f"'{char}' has correct num of occurrences: {numPeople}")
            yesByAll.append(char)

    numOfYesByAll += len(yesByAll)
    print(f"num of questions answered yes by all: {len(yesByAll)}")
    print(f"Current sum of questions to which everyone answered yes: {numOfYesByAll}")
    print()

print(numOfYesByAll)