using System;

using System.Collections.Generic;

public class Program

{ 

    public class Solution {

    private static bool HasDupes(char[] chars){

        List<int> nums = new List<int>();

        foreach(char c in chars){

            if(c == '.') continue;

            else nums.Add((int)c);            

        } 

        if(nums.Count == 0) return false;

        nums.Sort();

        for(int i = 0; i<nums.Count-1; i++){

            if(nums[i] == nums[i+1]) return true;

        }

        return false;

    }

        private static bool checkQ(int x, int y, char[,] board){

            int n =0;

            char[] chars = new char[9];

            for(int i=x; i<x+3; i++){

                for(int j = y; j<y+3; j++){

                    chars[n] = board[i,j];

                }

            }

            return HasDupes(chars);

        }

    public static bool IsValidSudoku(char[,] board) {

        char[] charLines = new char[9];

        char[] charRows = new char[9];

        for(int i=0; i<9; i++){

            for(int j=0; j<9; j++){

                charLines[j] = board[j,i]; 

                charRows[j] = board[i,j]; 

            }

            if(checkQ((i/3*3), (i%3*3), board)) return false;

            if(HasDupes(charLines) || HasDupes(charRows)) return false;

        }

        return true;

    }

    }   

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}