def isprime(n):   #判断n是不是素数

    for i in range():

        if n%i==0:

    else:

        return True

def strsum(word):  #统计单词的字母值总和

    dic={"a":1,"b":2,"c":3,"d":4,"e":5,"f":6,"g":7,"h":8,"i":9,"j":10,

         "k":11,"l":12,"m":13,"n":14,"o":15,"p":16,"q":17,"r":18,"s":19,

         "t":20,"u":21,"v":22,"w":23,"x":24,"y":25,"z":26}

    n=0

    for ch in word:

    return n

word=input("请输入一个单词:")

s=strsum(word)

if flag:

    print("这是一个素单词")

else:

    print("这不是一个素单词")

def ctob(c):            # 将一个字符转换为其对应的5位二进制编码

    n =

    ans = ""

    for i in range(5):

        r =

        n = n // 2

        ans = str(r) + ans

    return ans

def xor(s1, s2):        # 将二进制数s1和s2进行异或运算

    ans = ""

    for i in range(len(s1)):

        if :

            ans += "0"

        else:

            ans += "1"

    return ans

s = input("请输入明文（大写字母）：")

key = input("请输入密钥（大写字母）：")

ans = ""

for i in range(len(s)):

    s1 = ctob(s[i])

    k =

    s2 = ctob(key[k])

    b = xor(s1, s2)

    ans = ans + b

print("密文编码为：", ans)

# 输入n个数从小到大依次存储到列表nums中，代码略

k = -1

for i in range(n):

    if nums[i] < 0:

        k = i

    else:

        break

ans = []

i, j = k, k + 1

while i >= 0 or j < n:

    if i < 0:

        ans.append()

        j += 1

    elif j==n:

        ans.append(nums[i] * nums[i])

    elif :

        ans.append(nums[i] * nums[i])

        i -= 1

    else:

        ans.append(nums[j] * nums[j])

        j += 1

print(ans)