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- a = input()
- b = a.split(' ')
- c = []
- for i in range(1, len(b), 2):
- c.append(b[i])
- c.append(b[i - 1])
- if len(b) % 2 == 1:
- c.append(b[-1])
- res = ' '.join(c)
- print(res)
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