using System;
using System.Linq;
 
public class Test
{
	public static char[][]pHone = new char[8][]{new char[3]{ 'a','b','c'},new char[3]{'d','e','f'},new char[3]{'g','h','i'},new char[3]{'j','k','l'},new char[3]{'m','n','o'},new char[4]{'p','q','r','s'},new char[3]{'t','u','v'},new char[4]{'w','x','y','z'}};
	public static void Main()
	{
		// your code goes here
		Console.Write("{0}",string.Join(",", pHone[0].Select(x => x.ToString())));
	}
}

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