def encrypt(strng: str, key: int) -> str:
    assert (0 < key <= 94)
    encrypted = ''
    for x in strng:
        indx = ((ord(x) + key) % 256)
        if evaluate_condition(1, 'Gt', indx, 126):
            indx = (indx - 95)
        encrypted = (encrypted + chr(indx))
    return encrypted

def decrypt(strng: str, key: int) -> str:
    assert (0 < key <= 94)
    decrypted = ''
    for x in strng:
        indx = ((ord(x) - key) % 256)
        if evaluate_condition(2, 'Lt', indx, 32):
            indx = (indx + 95)
        decrypted = (decrypted + chr(indx))
    return decrypted