f=lambda x:x and~x[0]%2*x and x[:1]+f(x[1:])
print f([14, 42, 2324, 97090, 4080622, 171480372])
print f([42, 14, 42, 2324])
print f([7,14,42])
print f([])
print f([171480372, 13, 14, 42])
print f([42, 14, 42, 43, 41, 4080622, 171480372])
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[14, 42, 2324, 97090, 4080622, 171480372]
[42, 14, 42, 2324]
[]
[]
[171480372]
[42, 14, 42]