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[AtCoder]ABC-277|A - ^{-1}
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提出結果
def getIntMap():
return map(int, input().split())
def getIntList():
return list(map(int, input().split()))
def main():
n, x = getIntMap()
p = [0] + getIntList()
print(p.index(x))
if __name__ == "__main__":
main()
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