Выбор тайного друга

from sys import stdin
from random import shuffle
 
def foo(fullNames):
    shuffled = fullNames.copy()
    while fullNames == shuffled:
        shuffle(shuffled)
    return zip(fullNames, shuffled)
 
if __name__ == "__main__":
    fullNames = stdin.read().splitlines()
    print(len(fullNames))
    for pupil, friend in foo(fullNames):
        print(pupil + " - " + friend)

group = []
x1 = 1
countStudents = int(input("Write count students: "))
 
for times in range(0, countStudents):
    students = input("Write Surname and Name student:")
    group.append(students)
 
for main in range(0, len(group)):
    if main == len(group)-1:
        print(group[main], ' - ', group[0])
    else:
        print(group[main], ' - ', group[x1])
        x1 += 1

import sys
 
 
x1 = 1
group = list(map(str.strip, sys.stdin))
for main in range(0, len(group)):
    if main == len(group) - 1:
        print(group[main], ' - ', group[0])
    else:
        print(group[main], ' - ', group[x1])
        x1 += 1

import sys
import random
 
x1 = 1
group = list(map(str.strip, sys.stdin))
random.shuffle(group)
for main in range(0, len(group)):
    if main == len(group) - 1:
        print(group[main], ' - ', group[0])
    else:
        print(group[main], ' - ', group[x1])
        x1 += 1

group.insert(0, group.pop())

def all_perms(arr):
    n=len(arr)
    if (n==1):
        return [arr]
    else:
        tmp=all_perms(arr[1:])
        a=arr[0]
        res=[]
        for b in tmp:
            for i in range(n):
                z=b
                res=res+[z[0:i]+[a]+z[i:]]
        return res
        
def check(lst):
    for pair in lst:
        if pair[0]==pair[1]:
            return False
    return True        
        
def all_sec_friends(s):
    perms=all_perms(s)
    raw=list(map(lambda p: list(zip(s,p)),perms))
    return list(filter(check,raw))
        
print(all_sec_friends(["Иван Иванов","Саша Самойлов","Юля Северная"]))

from random import choice
def chooseFriend(People):
    Left = []
    Right = []
 
    while True:
        Friend_1 = choice(People)
        Friend_2 = choice(People)
 
        if Friend_1 == Friend_2:
            continue
 
        if Friend_1 not in Left:
            Left.append(Friend_1)
            
        if Friend_2 not in Right: 
            Right.append(Friend_2)
 
        if len(Left) == len(People) and len(Right) == len(People):
            break
 
    for i in range(len(People)):
        print(Left[i], '-', Right[i])

from random import choice
import sys
pupils = []
for line in sys.stdin:
    pupils.append(line.rstrip(' \n'))
choices = list()
for i in range(len(pupils)):
    list1 = pupils[:]
    del list1[i]
    a = choice(list1)
    if a not in choices:
        print(pupils[i], '-', a)
        choices.append(a)
    else:
        while a in choices:
            a = choice(list1)
        print(pupils[i], '-', a)
        choices.append(a)

import sys
from random import shuffle
data = list(map(str.strip, sys.stdin))
res = data[:]
while True:
    shuffle(res)
    if all(list(map(lambda x: data[x] != res[x], [i for i in range(len(data))]))):
        for j in range(len(data)):
            print(f'{data[j]} - {res[j]}')
        break