diff --git a/letter_digit.py b/letter_digit.py
index e69de29..7089556 100644
--- a/letter_digit.py
+++ b/letter_digit.py
@@ -0,0 +1,15 @@
+strng = 'world! 234' # string argument
+def letterAndDigit(str1):
+    assert isinstance(str1,str),'input variable should be a string'
+    diglist = []
+    alplist = []
+    for c in list(str1):
+        if c.isdigit():
+            diglist.append(c)
+        elif c.isalpha():
+            alplist.append(c)
+    countdig = len(diglist)
+    countchr = len(alplist)
+    return {'DIGITS':countdig, 'LETTERS':countchr}
+
+letterAndDigit(strng)
diff --git a/letter_digit.pyc b/letter_digit.pyc
new file mode 100644
index 0000000..10a670d
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diff --git a/tests/__init__.pyc b/tests/__init__.pyc
new file mode 100644
index 0000000..3b695ab
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diff --git a/tests/test_letterAndDigit.pyc b/tests/test_letterAndDigit.pyc
new file mode 100644
index 0000000..3177b34
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