import System;
import System.Text;

var t : int = Environment.TickCount;
var n : int = 20000;
var s : StringBuilder = new StringBuilder();
for(var i : int = 0; i < n; i++)
	s.Append("a");
print(s.ToString().Substring(n / 2, 10));
print((Environment.TickCount - t) + "ms");