@staticmethod
def a():
    (n, *xy) = map(int, sys.stdin.read().split())
    (*xy,) = zip(*([iter(xy)] * 2))
    print(xy)
    pass
@staticmethod
def a():
    (n, *xy) = map(int, sys.stdin.read().split())
    (*xy,) = zip(*([iter(xy)] * 2))
    print(xy)
    pass