diff --git a/Program.cs b/Program.cs
index f1d42df..e0d7881 100644
--- a/Program.cs
+++ b/Program.cs
@@ -1,4 +1,4 @@
 
 
 using AdventOfCode2021;
-var day = new day3("day3");
\ No newline at end of file
+var day = new day4("day4");
\ No newline at end of file
diff --git a/day4.cs b/day4.cs
index 61947f8..9367ed2 100644
--- a/day4.cs
+++ b/day4.cs
@@ -1,3 +1,67 @@
+using System.Diagnostics.Metrics;
+using System.Runtime.CompilerServices;
+using System.Security.Cryptography.X509Certificates;
+using System.Xml;
+
+class day4
+{
+    string[] input;
+    string[] number = "7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1".Split(',');
+
+
+
+    public day4(string day)
+    {
+        input = getInput(day);
+        part1();
+        part2();
+    }
+    public string[] getInput(string day)
+    {
+        string filepath = $"../../../inputs/{day}.txt";
+        string[] file = File.ReadAllLines(filepath);
+
+        return file;
+    }
+
+    public void part1()
+    {
+        List<Field> fields = new List<Field>();
+        int index = 0 ;
+        
+        while (index <= input.Length)
+        {
+            int rowIndex = 0;
+            var bingoField = new string[5, 5];
+            
+            while (rowIndex < 5) { 
+                for(int i = 0; i < 5; i++)
+                {
+                    bingoField[rowIndex,i] = $"[{input[index + rowIndex].Split(' ',StringSplitOptions.RemoveEmptyEntries)[i]}]";
+                }
+                rowIndex++;
+            }
+           
+            fields.Add(new Field(bingoField));
+            index += 6;
+        }
+
+        foreach(Field field in fields)
+        {
+            field.markNumber("13");
+            field.printField();
+        }
+
+
+        
+    }
+
+    public void part2()
+    {
+
+    }
+}
+
 class Field{
     
     string[,] bingoField = new string[5,5];
@@ -6,9 +70,38 @@ class Field{
         this.bingoField = bingoField;
     }
     public void markNumber(string markNumber){
-         int row = 5;
-         int columnn = 5;
+        for (int i = 0; i < 5; i++)
+        {
+            for (int j = 0; j < 5; j++)
+            {
+                if (bingoField[i, j].Contains(markNumber))
+                {
+                    bingoField[i, j] = $"[-{markNumber}-]";
+                }
+            }      
+        }
+    }
+    public void checkBingo()
+    {
+        bool bingo = false;
+        int checkCounter = 0;
+        for(int i = 0; i < 5; i++)
+        {
+
+        }
+    }
+    public void printField()
+    {
+        for (int i = 0; i < 5; i++)
+        {
+            for(int j = 0; j < 5; j++) {
+                Console.Write(bingoField[i,j]); 
+            }
+            Console.WriteLine(" ");
+        }
+        Console.WriteLine("\n");
+
+
 
-         
     }
     }
\ No newline at end of file
diff --git a/inputs/day4.txt b/inputs/day4.txt
new file mode 100644
index 0000000..fb89fd6
--- /dev/null
+++ b/inputs/day4.txt
@@ -0,0 +1,17 @@
+22 13 17 11  0
+ 8  2 23  4 24
+21  9 14 16  7
+ 6 10  3 18  5
+ 1 12 20 15 19
+
+ 3 15  0  2 22
+ 9 18 13 17  5
+19  8  7 25 23
+20 11 10 24  4
+14 21 16 12  6
+
+14 21 17 24  4
+10 16 15  9 19
+18  8 23 26 20
+22 11 13  6  5
+ 2  0 12  3  7
\ No newline at end of file