alph = {
    "a": ["apple", "abandon", "ant"],
    "b": ["banana", "bee", "become"],
    "c": ["cat", "come"],
    "d": "down",
}
user_input = input()

if isinstance(alph[user_input],list):
    for element in alph[user_input]:
        print(element,end = " ")
    print()
else:
    print(alph[user_input])