#!/usr/bin/env python
import sys
from functools import partial
from itertools import takewhile
 
def get_tokens(stream=sys.stdin):
    token = []
    for char in iter(partial(stream.read, 1), ''):
        if char.isspace(): # use any space as a separator
            yield ''.join(token)
            del token[:]
        else:
            token.append(char)
    if token:
        yield ''.join(token)
 
print(' '.join(takewhile(lambda s: s != '-1', get_tokens())))
 
 

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