sw

def swap_pair(string, pair):
    text = string.replace(pair[0], pair[1])
    return text


def swap_adj(string):
    if len(string) % 2 == 1:
        string = string[0:-1]
    text = ""
    odds = ""
    evens = ""
    for i in range(len(string)):
        if i % 2 == 1:
            odds += string[i]
        else:
            evens += string[i]
    for i in range(len(odds)):
        text += odds[i]
        text += evens[i]
    return text


def finalize(sting):
    text = sting
    while True:
        if text[0] == " ":
            text = text[1:]
        elif text[-1] == " ":
            text = text[:-1]
        else:
            break
    text = swap_pair(text, "z ")
    text = text[-1].upper() + text[:-1].lower() + "A+."
    return text

print(finalize("  CORE: zs  "))

def decode_string(string, pair):
    print("Original", string)
    swapped_pair = swap_pair(string,pair)
    swapped_adj = swap_adj(swapped_pair)
    print("Final:  ", finalize(swapped_adj))