def trim(s):
if len(s) == 0: return s elif s[0] == ' ': return trim(s[1:]) elif s[-1] == ' ': return trim(s[:-1]) else: return s
a = input()
b = trim(a)
print(b)
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纯情小男Yin
def trim(s):
a = input()
b = trim(a)
print(b)