diff --git a/05_docstring/submissions/ball133.py b/05_docstring/submissions/ball133.py
new file mode 100644
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--- /dev/null
+++ b/05_docstring/submissions/ball133.py
@@ -0,0 +1,27 @@
+import numpy as np
+
+
+def afunc(array1: np.ndarray, array2: np.ndarray, mode: str = "+", pow: int = 2) -> np.ndarray:
+    """Sums two matrices, then exponentiates each element by pow power.
+
+    Args:
+        array1: A numpy.ndarray.
+        array2: A numpy.ndarray.
+        mode: A string representing '+' or '-' matrix operations.
+        pow: An integer representing the power.
+
+    Returns:
+        A numpy.ndarray matrix, summing the passed matrices and exponentiating each element by pow.
+    """
+    assert array1.shape == array2.shape, "size mismatch"
+    assert type(pow) == int, "pow should be type int"
+
+    if mode == "+":
+        result = array1 + array2
+    elif mode == "-":
+        result = array1 - array2
+    else:
+        raise ValueError(f"mode is either '+' or '-' but got {mode}")
+
+    result = result**pow
+    return result