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17 lines
296 B
Scala
17 lines
296 B
Scala
import scala.io.StdIn._
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val items = Iterator
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.continually(readLine)
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.takeWhile(_ != null)
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.toList
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val res = items
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.combinations(2)
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.map(x => x(0) zip x(1))
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.dropWhile(_.count(t => t._1 != t._2) != 1)
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.map(_.filter(t => t._1 == t._2).map(_._1))
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.next
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println(res.mkString(""))
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