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import io._
def countNucleotides (dna: Stream[Char]): List[Int] = {
var a, c, g, t = 0
for (base <- dna) {
base match {
case 'A' => a += 1
case 'C' => c += 1
case 'G' => g += 1
case 'T' => t += 1
case c => println("Unknown character: " + c)
}
}
List(a, c, g, t)
}
val dna = Source.fromInputStream(System.in).toStream.takeWhile(_ != '\n')
println(countNucleotides(dna).mkString(" "))
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