fixed typo

Author: learnbyexample

exercise_solutions/q2a_int_length.py

@@ -15,7 +15,7 @@ def len_int(n):
 assert len_int(962306349871524124750813401378124) == 33
 
 try:
-    assert len_int('a')
+    len_int('a')
 except TypeError as e:
     assert str(e) == 'provide only integer input'