def l(a):
    from itertools import count
    for i in count():
        if a(i) is None:
            return i
 
def r(k, a):
    l_a = l(a)
    return lambda i: a(i % l_a) if i < l_a * k else None
 
def c(a, b):
    l_a, l_b = l(a), l(b)
    return lambda i: a(i) if i < l_a else b(i - l_a) if i < l_a + l_b else None
 
def s(c):
    assert len(c) == 1
    return lambda i: c if i == 0 else None
 
def p(a):
    print ''.join(a(i) for i in range(l(a)))
 
if __name__ == '__main__':
    p(c(r(3,c(r(3,s('9')),s('1'))),s('2')))

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