- def doit(list1, list2): 
-     lastmatch = -1 
-     lastunmatch = -1 
-     for i, x in enumerate(zip(list1, list2)): 
-         if x[0] == x[1]: 
-             lastmatch = i                 
-         else: 
-             lastunmatch = i 
-         print abs(lastmatch - lastunmatch) 
-   
- list1 = ['cat', 'sat', 'on', 'mat', 'xx', 'yy']  
- list2 = ['cow', 'sat', 'on', 'carpet', 'xx', 'yy'] 
-   
- doit(list1, list2) 
-   
-   
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