import os
# Module to hide password input
import getpass

# Clear screen
os.system("clear") # Mac or Linux
#os.system("cls") # Windows

# Get user input (will not show in terminal upon input)
userInput = getpass.getpass("Input a password: ")

# Reset criteria to unfulfilled
letterCriteria = False
numberCriteria = False
lengthCriteria = False

# Check length criteria (>= 12 characters long)
# Store true or false in variable lengthCriteria
lengthCriteria = len(userInput) >= 12

# Iterate the password, character by character
for i in userInput:
    # Test if character is alpha
    # If so, set letterCriteria to true (critera fulfilled)
    if i.isalpha():
        letterCriteria = True

    # Test if character is digit
    # If so, set numberCriteria to true (critera fulfilled)
    if i.isdigit():
        numberCriteria = True

# Check if all critera is fulfilled (variables are True)
if letterCriteria and numberCriteria and lengthCriteria:
    print("Password fulfilled all the criteria.")
else:
    print("Password must contain at least one letter and one digit, and contain at least 12 characters.")