subtask #1的样例是

26 26
A<B
B<C
C<D
D<E
E<F
F<G
G<H
H<I
I<J
J<K
K<L
L<M
M<N
N<O
O<P
P<Q
Q<R
R<S
S<T
T<U
U<V
V<W
W<X
X<Y
Y<Z
Z<A

为什么它的答案是

Sorted sequence determined after 25 relations: ABCDEFGHIJKLMNOPQRSTUVWXYZ.

而不是

Inconsistency found after 26 relations.