class A:
    def __init__(self, txt: str):
        self.p: H = None
        self.w: G = None
        self.v: G = None
        self.r: E = None
        self.q: G = None
        self.u: E = None
        self.y: E = None
        self.txt = txt

class B:
    def __init__(self, txt: str):
        self.p: G = None
        self.r: J = None
        self.v: E = None
        self.s: J = None
        self.t: G = None
        self.q: I = None
        self.u: F = None
        self.txt = txt

class C:
    def __init__(self, txt: str):
        self.q: D = None
        self.x: D = None
        self.s: J = None
        self.v: B = None
        self.w: G = None
        self.txt = txt

class D:
    def __init__(self, txt: str):
        self.q: G = None
        self.w: B = None
        self.u: A = None
        self.x: E = None
        self.o: A = None
        self.txt = txt

class E:
    def __init__(self, txt: str):
        self.x: J = None
        self.s: H = None
        self.o: I = None
        self.t: I = None
        self.p: J = None
        self.u: A = None
        self.r: B = None
        self.txt = txt

class F:
    def __init__(self, txt: str):
        self.o: G = None
        self.t: A = None
        self.r: C = None
        self.x: A = None
        self.txt = txt

class G:
    def __init__(self, txt: str):
        self.q: J = None
        self.r: H = None
        self.z: C = None
        self.s: J = None
        self.y: J = None
        self.x: B = None
        self.u: J = None
        self.o: F = None
        self.w: E = None
        self.p: E = None
        self.txt = txt

class H:
    def __init__(self, txt: str):
        self.x: B = None
        self.z: D = None
        self.y: E = None
        self.w: D = None
        self.r: E = None
        self.q: C = None
        self.s: E = None
        self.u: F = None
        self.txt = txt

class I:
    def __init__(self, txt: str):
        self.s: A = None
        self.p: F = None
        self.y: E = None
        self.o: G = None
        self.z: J = None
        self.r: E = None
        self.txt = txt

class J:
    def __init__(self, txt: str):
        self.p: B = None
        self.t: A = None
        self.s: G = None
        self.u: I = None
        self.r: E = None
        self.q: E = None
        self.txt = txt

j = A("j")
b = B("b")
i = C("i")
n = D("n")
k = E("k")
c = F("c")
f = G("f")
a = H("a")
l = I("l")
e = J("e")

j.p = a
j.w = f
j.v = f
j.q = f
j.r = k
j.u = k
j.y = k
b.p = f
b.t = f
b.r = e
b.s = e
b.v = k
b.q = l
b.u = c
i.q = n
i.x = n
i.s = e
i.v = b
i.w = f
n.q = f
n.w = b
n.u = j
n.o = j
n.x = k
k.x = e
k.p = e
k.s = a
k.o = l
k.t = l
k.u = j
k.r = b
c.o = f
c.t = j
c.x = j
c.r = i
f.q = e
f.s = e
f.y = e
f.u = e
f.r = a
f.z = i
f.x = b
f.o = c
f.w = k
f.p = k
a.x = b
a.z = n
a.w = n
a.y = k
a.r = k
a.s = k
a.q = i
a.u = c
l.s = j
l.p = c
l.y = k
l.r = k
l.o = f
l.z = e
e.p = b
e.t = j
e.s = f
e.u = l
e.r = k
e.q = k
assert b.r.u.s.txt == "
class A:
    def __init__(self, txt: str):
        self.p: H = None
        self.w: G = None
        self.v: G = None
        self.r: E = None
        self.q: G = None
        self.u: E = None
        self.y: E = None
        self.txt = txt

class B:
    def __init__(self, txt: str):
        self.p: G = None
        self.r: J = None
        self.v: E = None
        self.s: J = None
        self.t: G = None
        self.q: I = None
        self.u: F = None
        self.txt = txt

class C:
    def __init__(self, txt: str):
        self.q: D = None
        self.x: D = None
        self.s: J = None
        self.v: B = None
        self.w: G = None
        self.txt = txt

class D:
    def __init__(self, txt: str):
        self.q: G = None
        self.w: B = None
        self.u: A = None
        self.x: E = None
        self.o: A = None
        self.txt = txt

class E:
    def __init__(self, txt: str):
        self.x: J = None
        self.s: H = None
        self.o: I = None
        self.t: I = None
        self.p: J = None
        self.u: A = None
        self.r: B = None
        self.txt = txt

class F:
    def __init__(self, txt: str):
        self.o: G = None
        self.t: A = None
        self.r: C = None
        self.x: A = None
        self.txt = txt

class G:
    def __init__(self, txt: str):
        self.q: J = None
        self.r: H = None
        self.z: C = None
        self.s: J = None
        self.y: J = None
        self.x: B = None
        self.u: J = None
        self.o: F = None
        self.w: E = None
        self.p: E = None
        self.txt = txt

class H:
    def __init__(self, txt: str):
        self.x: B = None
        self.z: D = None
        self.y: E = None
        self.w: D = None
        self.r: E = None
        self.q: C = None
        self.s: E = None
        self.u: F = None
        self.txt = txt

class I:
    def __init__(self, txt: str):
        self.s: A = None
        self.p: F = None
        self.y: E = None
        self.o: G = None
        self.z: J = None
        self.r: E = None
        self.txt = txt

class J:
    def __init__(self, txt: str):
        self.p: B = None
        self.t: A = None
        self.s: G = None
        self.u: I = None
        self.r: E = None
        self.q: E = None
        self.txt = txt

j = A("j")
b = B("b")
i = C("i")
n = D("n")
k = E("k")
c = F("c")
f = G("f")
a = H("a")
l = I("l")
e = J("e")

j.p = a
j.w = f
j.v = f
j.q = f
j.r = k
j.u = k
j.y = k
b.p = f
b.t = f
b.r = e
b.s = e
b.v = k
b.q = l
b.u = c
i.q = n
i.x = n
i.s = e
i.v = b
i.w = f
n.q = f
n.w = b
n.u = j
n.o = j
n.x = k
k.x = e
k.p = e
k.s = a
k.o = l
k.t = l
k.u = j
k.r = b
c.o = f
c.t = j
c.x = j
c.r = i
f.q = e
f.s = e
f.y = e
f.u = e
f.r = a
f.z = i
f.x = b
f.o = c
f.w = k
f.p = k
a.x = b
a.z = n
a.w = n
a.y = k
a.r = k
a.s = k
a.q = i
a.u = c
l.s = j
l.p = c
l.y = k
l.r = k
l.o = f
l.z = e
e.p = b
e.t = j
e.s = f
e.u = l
e.r = k
e.q = k
assert b.r.u.s.txt == "j"