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using System;
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namespace RosettaCode
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{
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class Program
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{
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static void Main(string[] args)
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{
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string text = Math.Abs(int.Parse(Console.ReadLine())).ToString();
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Console.WriteLine(text.Length < 2 || text.Length % 2 == 0 ? "Error" : text.Substring((text.Length - 3) / 2, 3));
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}
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}
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}
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