static void Main(string[] args)
{
var solution = new Solution();
while (true)
{
//int input = int.Parse(Console.ReadLine());
//int input2 = int.Parse(Console.ReadLine());
//int input3 = int.Parse(Console.ReadLine());
//string input = Console.ReadLine();
//string input2 = Console.ReadLine();
//int[] intArr = input.Split(',').Select(s => int.Parse(s)).ToArray();
//int input2 = int.Parse(Console.ReadLine());
//var builder = new DataStructureBuilder();
//int?[] data = new int?[] { 1, 2, 3, 4, 5, null, 6, null, null, 7, 8 };
//var tree = builder.BuildTree(data);
//var listNode = builder.BuildListNode(new int[] { 1, 4, 5 });
//int[][] arr = new int[3][] { new int[] { 1, 3, 1 }, new int[] { 1, 5, 1 }, new int[] { 4, 2, 1 } };
//string input = "abcbefga";
//string input2 = "dbefga";
//int[] nums1 = new int[] { 1, 2, 3 };
//int[] nums2 = new int[] { 1, 1 };
//IList<IList<int>> data = new List<IList<int>>()
//{
// new List<int>() { 1, 3 },
// new List<int>() { 3, 0, 1 },
// new List<int>() { 2 },
// new List<int>() { 0 }
// //new List<int>() { 1 },
// //new List<int>() { 2 },
// //new List<int>() { 3 },
// //new List<int>() { }
//};
string str = "ABAB";
var res = solution.CharacterReplacement(str, 2);
ConsoleX.WriteLine(res);
}
}