# generate.py
# Reproduce the shifting process to generate the challenge string

def shift_letter(letter, shift):
    start = ord('A') if letter.isupper() else ord('a')
    return chr(start + (ord(letter) - start + shift) % 26)


def generate(plaintext):
    out = ""
    i = 25  # starting shift

    for c in plaintext:
        if c in ['{', '}', '_']:
            # Not shifted — added directly
            out += c
            continue

        # Apply shift and decrease shift counter
        out += shift_letter(c, i)
        i -= 1

    return out


if __name__ == "__main__":
    # Example usage:
    flag = "CTF{make_caesar_cipher_great_again}"
    print(generate(flag))