import sys

translate = {
    '._': 'A',
    '_...': 'B',
    '_._.': 'C',
    '_..': 'D',
    '.': 'E',
    '.._.': 'F',
    '__.': 'G',
    '....': 'H',
    '..': 'I',
    '.___': 'J',
    '_._': 'K',
    '._..': 'L',
    '__': 'M',
    '_.': 'N',
    '___': 'O',
    '.__.': 'P',
    '__._': 'Q',
    '._.': 'R',
    '...': 'S',
    '_': 'T',
    '.._': 'U',
    '..._': 'V',
    '.__': 'W',
    '_.._': 'X',
    '_.__': 'Y',
    '__..': 'Z',
}

def mogrificate(l, your_index, r, sofars=None):
    if sofars is None:
        sofars = []
    for i in xrange(MIN_LEN, MAX_LEN + 1):
        substr = ''.join(l[your_index:i])
        if substr in translate:
            current_letter = translate[substr]
            sofars.append(current_letter)
    print sofars

MIN_LEN = min(len(k) for k in translate)
MAX_LEN = max(len(k) for k in translate)

letters = [i for i in sys.stdin.readline().strip()]
results = []

mogrificate(letters, 0, results)