diff --git a/students_submissions/gcd_fs388.py b/students_submissions/gcd_fs388.py
new file mode 100644
index 0000000..833b846
--- /dev/null
+++ b/students_submissions/gcd_fs388.py
@@ -0,0 +1,19 @@
+def gcd(a: int, b: int) -> int:
+    # Validate inputs
+    if not isinstance(a, int) or not isinstance(b, int):
+        print("Error: Both inputs must be integers.")
+        return None
+    
+    # Handle negative numbers
+    a = abs(a)
+    b = abs(b)
+    # Base case
+    if b == 0:
+        return a
+    # Recursive case
+    return gcd(b, a % b)
+# Test cases
+print(gcd(54, 24))  # Expected output: 6
+print(gcd(48, 18))  # Expected output: 6
+print(gcd(101, 10))  # Expected output: 1
+print(gcd(-54, 24))  # Expected output: 6