diff --git a/projects/013-tokenizing-a-string/python/main.py b/projects/013-tokenizing-a-string/python/main.py
index e69de29b..86a8869b 100644
--- a/projects/013-tokenizing-a-string/python/main.py
+++ b/projects/013-tokenizing-a-string/python/main.py
@@ -0,0 +1,30 @@
+
+def tokenize(user_expression):
+    token_list = []
+    is_prev_number = False
+
+    for digit in user_expression:
+        if digit.isnumeric():
+            if is_prev_number == True:
+                new_digit = prev_digit + digit
+                token_list.pop()
+                token_list.append(new_digit)
+                prev_digit = new_digit
+                    
+            else:
+                token_list.append(digit)
+                prev_digit = digit
+                is_prev_number = True
+                
+        elif digit == ' ':
+            is_prev_number = False
+
+        else:
+            token_list.append(digit)
+            is_prev_number = False
+    
+    return token_list
+
+user_math = input('Insert a mathematical expression: ')
+
+print(tokenize(user_math))
\ No newline at end of file