import re
from string import ascii_lowercase, ascii_uppercase

EXAMPLE = """
2-4,6-8
2-3,4-5
5-7,7-9
2-8,3-7
6-6,4-6
2-6,4-8
"""

def clean(text: str) -> list[str]:
    return list(filter(lambda l: l.strip() != "", text.splitlines()))

def solve(lines: list[str]):
    s = 0
    for (i, line) in enumerate(lines):
        s1, s2 = line.split(',')
        a, b = s1.split('-')
        c, d = s2.split('-')
        a = int(a)
        b = int(b)
        c = int(c)
        d = int(d)
        a = set(list(range(a, b + 1)))
        b = set(list(range(c, d + 1)))
        if a <= b or b <= a:
            s += 1
    return s

def solve2(lines: list[str]):
    s = 0
    for (i, line) in enumerate(lines):
        s1, s2 = line.split(',')
        a, b = s1.split('-')
        c, d = s2.split('-')
        a = int(a)
        b = int(b)
        c = int(c)
        d = int(d)
        a = set(list(range(a, b + 1)))
        b = set(list(range(c, d + 1)))
        c = a.intersection(b)
        if c:
            s += 1
    # 7:08
    return s

def main():
    example = clean(EXAMPLE)
    print("Example  1:", solve(example))

    data = clean(open("i4.txt").read())
    print("Solution 1:", solve(data))

    example = clean(EXAMPLE)
    print("Example  2:", solve2(example))

    data = clean(open("i4.txt").read())
    print("Solution 2:", solve2(data))

if __name__ == "__main__":
    main()