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문제

헤라클레스는 그리스 신화의 유명한 비극적인 영웅이다. 그는 제우스의 사생아로 태어났는데, 이때문에 제우스의 아내 헤라는 그를 매우 싫어했다. 그는 매우 강한 힘과 높은 지식을 가졌지만, 동시에 자신의 아이들이나, 그의 많은 스승들, 연인들 등을 스스로 죽이는 광기도 함께 가졌다. 그는 그의 아이들을 죽인 죄로, 에우리스테우스 왕이 내린 12가지의 과업을 수행해야 했던 인물로 잘 알려져 있다.

그 과업 중 두 번째는 바로 거대하고, 여러 개의 머리를 가진 히드라를 죽이라는 것이었다. 그런데 이 히드라는 헤라가 헤라클레스를 죽이려는 목적으로 만든 괴물이었다.

히드라를 죽이는 데 있어 큰 문제는, 머리 하나를 날려버리면, 2개의 새 머리가 나온다는 것이었고, 히드라는 머리가 하나 이상 남아있다면 죽지 않았다. 헤라클레스의 조카 이올라우스는 그 머리들을 자를 때 그 밑동에 불을 지지면 머리가 다시 자라나지 않는다는 사실을 깨달았다.

이런 상황에서, 헤라클레스와 이올라우스는 일련의 연속된 행동을 수행하는데, 이 행동은 그냥 히드라의 머리를 자르는 것과, 자름과 동시에 불로 지지는 두 가지 중 하나이다. 이 일련의 행동이 끝난 뒤 몇 개의 머리가 남아있는지를 결정하라.

입력

입력의 첫 번째 줄은 data set의 개수 K가 주어진다.

각 data set의 첫 번째 줄에는 히드라의 머리 개수 1 ≤ h ≤ 50 가 주어진다.

두 번째 줄에는 헤라클레스와 이올라우스의 일련의 행동들이 100글자 이하로 이루어진 문자열로 주어지는데, 이때 'c'는 불로 지지지 않고 머리만 자르는 것을 뜻하고, 'b'는 머리를 자른 후 불로 지지는 것을 뜻한다.

입력은 히드라의 머리를 모두 제거했다면 더 이상의 행동은 없도록 주어진다.

출력

각 data set에 대한 출력의 첫 번째 줄은 "Data Set x:" 이다.

그 다음 줄에 헤라클레스와 이올라우스의 행동이 끝난 후 남아있는 히드라의 머리 개수를 출력한다.

각각의 data set 사이에는 빈 칸이 존재한다.

예제 입력 1

2
10
cbbbbccbb
10
bbbbbbbbbccbbb

예제 출력 1

Data Set 1:
7

Data Set 2:
0
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He was a half-god illegitimate child of Zeus and Hera, hated by his mother who did whatever she could to make his life hell, and preferably get him killed. He possessed superhuman strength and high intelligence, but was also given to madness, killing his children, many of his teachers, bosses, lovers, and others. He is famous for 12 labors he had to perform for his archenemy Eurystheus, as a punishment for killing his own children.<\/p>\r\n\r\n<p>The second of these labors involved killing the Lernaean Hydra, a giant multi-headed super-venomous<sup>2<\/sup> serpent bred specifically by Heracles&rsquo;s mother for the purpose of killing Heracles (and a few innocent people). The big problem with killing the hydra was that as soon as one chopped off a head, two new ones sprouted up in its place, and the hydra was alive as long as it had at least one head. Heracles&rsquo;s nephew Iolaus eventually realized that the heads did not regrow when the stump was cauterized (scorched with a firebrand).<\/p>\r\n\r\n<p>In this problem, you will be given a sequence of actions that Heracles and Iolaus took, which is either just chopping off a head, or chopping+cauterizing. You are to determine how many heads will be left at the end.<\/p>\r\n\r\n<p><sup>1<\/sup>known to Romans as &ldquo;Hercules&rdquo;<\/p>\r\n\r\n<p><sup>2<\/sup>In fact, Heracles used the venom to dip his arrows and kill a few other monsters with it later.<\/p>\r\n","input":"<p>The first line is the number K of input data sets, followed by the K data sets, each of the following form:<\/p>\r\n\r\n<p>The first line of a data set is an integer 1 &le; h &le; 50, the initial number of heads of the hydra. The second line is a string of at most 100 characters, each either a lowercase &lsquo;c&rsquo; (for chopping off a head without cauterizing), or &lsquo;b&rsquo; (for chopping with cauterizing).<\/p>\r\n","output":"<p>For each data set, output &ldquo;Data Set x:&rdquo; on a line by itself, where x is its number.<\/p>\r\n\r\n<p>Then, on a line by itself, print the number of heads the hydra has at the end of the sequence. The inputs will never be such that Heracles chops off more heads than the hydra has.<\/p>\r\n\r\n<p>Each data set should be followed by a blank line.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"English"}]

출처

University > The USC Programming Contest > Spring 2014: Greek Mythology A번