Поиск однофамильцев в списке

men_works = set()
men = int(input())
cout = 0
for i in range(men):
    name = input()
    if name in men_works:
        cout += 1
    else:
        men_works.add(name)
print(cout)

from collections import Counter
line = "Иванов Петров Сидоров Петров Иванов Петров"
counter = Counter(line.split(' ')) # разбить строку по пробелам и посчитать похожие фамилии
result = 0
for last_name in counter:
    result += counter[last_name] if counter[last_name] > 1 else 0
print('counter:', counter)
print('result:', result)

if name in men_works:
        cout += 1

men = int(input())
men_works = [input() for _ in range(men)]
result = 0
for example in set(men_works):
    cout = 0
    for name in men_works:
        if example == name:
            cout += 1
    if cout >1:
        result += cout
print(result)

men = int(input())
men_works = {}
for _ in range(men):
    name = input()
    men_works[name] = men_works.get(name,0)+1
print(sum((i for i in men_works.values() if i >1)))

line = "Иванов Петров Сидоров Петров Иванов Петров".split()
counter = {}
result = 0
for last_name in line:
    if last_name in counter:
        result += 2 if counter[last_name] is 1 else 1
        counter[last_name] += 1
    else:
        counter[last_name] = 1
print('counter:', counter)
print('result:', result)

container = (i for i in men_wokrs.values() if i > 1)
sum = sum(container)
print(sum)

#container = (i for i in men_wokrs.values() if i > 1)
container = []
for i in men_works.values():
    if i > 1:
        container.append(i)
print(sum(container))