diff --git a/Week04/arrays_seda_sengul_ozkaya.py b/Week04/arrays_seda_sengul_ozkaya.py
new file mode 100644
index 0000000..3258b60
--- /dev/null
+++ b/Week04/arrays_seda_sengul_ozkaya.py
@@ -0,0 +1,28 @@
+import numpy as np
+
+def replace_center_with_minus_one(d, n, m):
+
+    if m > n:
+        raise ValueError("m cannot be greater than n.")
+    if d <= 0:
+        raise ValueError("d must be positive.")
+    if n <= 0:
+        raise ValueError("n must be positive.")
+    if m < 0:
+        raise ValueError("m cannot be negative.")
+
+    low = 10 ** (d - 1)
+    high = 10 ** d
+    arr = np.random.randint(low, high, size=(n, n))
+
+   
+    start = (n - m) // 2
+    end = start + m
+
+    if n % 2 == 0 and m % 2 == 1:
+        start -= 1
+        end -= 1
+
+    arr[start:end, start:end] = -1
+
+    return arr