from fileio import open
let f = open('test/day6.in')
let lines = f.read().split('\n')[:-1]

let a = {}
let b = 0
for line in lines:
    if not len(line):
        b += len(a)
        a = {}
        continue
    for c in line:
        a[c] = 1

b += len(a)
print(b) # 6430

def count(d):
    let c = 0
    for k in d.keys():
        if d[k] == 1:
            c += 1
    return c

def letters():
    let d = {}
    for c in 'abcdefghijklmnopqrstuvwxyz':
        d[c] = 1
    return d

a = letters()
b = 0
for line in lines:
    if not len(line):
        b += count(a)
        a = letters()
        continue
    for c in 'abcdefghijklmnopqrstuvwxyz':
        if c not in line and c in a and a[c] == 1:
            a[c] = 0

b += count(a)
print(b) # 3125