using System;
using System.Security.Cryptography;
using System.Text;
 
public class Test
{
	public static void Main()
	{
	    var sha1 = new System.Security.Cryptography.SHA1Managed();
	    var plaintextBytes = Encoding.Unicode.GetBytes("1981");
	    var hashBytes = sha1.ComputeHash(plaintextBytes);
 
	    var sb = new StringBuilder();
	    foreach (var hashByte in hashBytes)
	    {
	        sb.AppendFormat("{0:x2}", hashByte);
	    }
 
	    var hashString = sb.ToString();
 
	    Console.WriteLine(hashString);
	}
}

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