list_a = []
list_b=[]
with open("chean.txt","r") as a:
    for line in a.readlines():
        screen_a = line.strip()
        if screen_a not in list_a and screen_a !="":
            list_a.append(screen_a)


with open("screen_lot.txt","r") as b:
    for line in b.readlines():
        screen_b = line.strip().split(",")[1]
        if screen_b not in list_b and screen_b !="":
            list_b.append(screen_b)

print(len(list_a),list_a)
print(len(list_b),list_b)

list_c = list(set(list_b).difference(set(list_a)))
list_c.sort()
print(len(list_c),list_c)