Subtract 11 from entire list of quoted numbers

[Pleiades]

Hi I really need to subtract 11 just from every quoted number in the list. I have looked every where for help on this topic except here so I hope someone can help.

Here is the code:

list1 = [ 1, '33', 2, '49', 3, '63', 4, '77', 5, '91', 6, '119', 7, '121', 8, '133', 9, '141', 10, '143', 11, '153', 12, '161', 13, '169', 14, '183', 15, '187', 16, '203', 17, '209', 18, '217', 19, '221', 20, '231', 21, '243', 22, '247', 23, '253', 24, '259', 25, '273', 26, '287', 27, '289', 28, '299', 29, '301']
 


print (list1-11)
  

[Larz60+]

• iterate through list1 elements
  
• check element type if isinstance(list1[idx], str): ...
  
• subtract 11 from list1[idx] by:
  
• • convert element to int
    
  • subtract 11
    
  • convert element back to str
    
• next iteration