public class AffinLin
{
	String toChipher = null;
	int a = 1, b = 0;
	
	public AffinLin (int a, int b, String toChipher)
	{
		this.a = a;
		this.b = b;
		
		this.toChipher = toChipher;
		
		System.out.println (toChipher);
		
		for (int i = 0; i < toChipher.length (); ++i)
			System.out.print (chipherChar (a, b, toChipher.charAt (i)));
		System.out.print ("\n");
	}
	
	private char chipherChar (int a, int b, char character)
	{
		int returnValue = ((int)character);
		
		returnValue -= ((int)'a');
		
		returnValue = ((a * returnValue) + b) % 26;
		
		returnValue += ((int)'a');
		
		return ((char)returnValue);
	}
			
		
	public static void main (String args [])
	{
		int a = 1;
		int b = 0;

		if (args.length != 3)
		{
			System.out.println ("Usage java AffinLin a b Text");
			System.exit (1);
		}
		
		if (args [2].matches (".*[^a-z].*"))
		{
			System.out.println ("Sorry Text to Chipher are not allowed to contain any characters except [a-z]");
			System.exit (1);
		}

		try
		{
			a = Integer.parseInt (args[0]);
		}
		catch (NumberFormatException nfexcp) 
		{
			System.out.println ("a was not a number but: "+a);
			System.exit (1);
		}
		
		try
		{
			b = Integer.parseInt (args[1]);
		}
		catch (NumberFormatException nfexcp)
		{
			System.out.println ("b was not a number but: "+b);
			System.exit (1);
		}
		
		new AffinLin (a, b, args [2]);	
	}
}