import os

def generate_substitution_cipher(flag):
    substitution_rules = []
    for i, char in enumerate(flag):
        position = i + 1  # 1-based index
        if char.isalpha():
            if char.isupper():
                substitution_rules.append(f"the {position}th letter is '{char}', upper.\n")
            else:  # char is lowercase
                substitution_rules.append(f"the {position}th letter is '{char}', lower.\n")
        else:
            # 对于非字母字符，记录其位置和类型
            substitution_rules.append(f"the {position}th letter is '{char}', character.\n")

    # 生成替换字典
    substitution_dict = {
        'a': 'z', 'b': 'i', 'c': 'j', 'd': 'r', 'e': 'd', 'f': 'u', 'g': 'a',
        'h': 'e', 'i': 'n', 'j': 'o', 'k': 'm', 'l': 'f', 'm': 'k', 'n': 'l',
        'o': 'v', 'p': 'q', 'q': 'x', 'r': 'y', 's': 'c', 't': 't', 'u': 'p',
        'v': 'h', 'w': 's', 'x': 'w', 'y': 'b', 'z': 'g',
        'A': 'Z', 'B': 'I', 'C': 'J', 'D': 'R', 'E': 'D', 'F': 'U', 'G': 'A',
        'H': 'E', 'I': 'N', 'J': 'O', 'K': 'M', 'L': 'F', 'M': 'K', 'N': 'L',
        'O': 'V', 'P': 'Q', 'Q': 'X', 'R': 'Y', 'S': 'C', 'T': 'T', 'U': 'P',
        'V': 'H', 'W': 'S', 'X': 'W', 'Y': 'B', 'Z': 'G',
        ' ': ' '  # 保持空格不变
    }
    
    substitution_rules.append("Pack my box with five dozen liquor jugs.")
    encrypted_rules = []
    for rule in substitution_rules:
        for char in rule:
            if char in substitution_dict:
                encrypted_rules.append(substitution_dict[char])
            else:
                encrypted_rules.append(char)
    # 应用替换字典
    return ''.join(encrypted_rules)

# 示例Flag
flag = os.getenv("GZCTF_FLAG", "Woodpecker{test-Flag_0}")
cipher_text = generate_substitution_cipher(flag)
print(cipher_text)