문제
양의 정수 a, b에 대해서, a의 b 초지수승은 a ↑↑ b와 같이 나타낸다. 초지수승의 정의는 다음과 같다.
a ↑↑ 1 = a,
a ↑↑ (k + 1) = a ^ (a ↑↑ k)
따라서 예를 들면, 3↑↑2 = 3^3 = 27 이고, 3↑↑3 = 3^27 =わ 7625597484987이다.
a ↑↑ b의 마지막 8자리를 출력하세요.
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