Given the following example list of strings:

["ABC: {"UserName": "A111", "Something": "aaa"}",
 "ABC: {"UserName": "A222", "Something": "bbb"}",
 "ABC: {"UserName": "A333", "Something": "ccc"}"]

I would like to extract a list of substrings identical to all strings in the list (if exist), in series.
So in this example the output would be:

["ABC: {"UserName": "A", 
 ", "Something": "", 
 ""}"]

The input list of strings could be up to a few thousand, and the length of each could be up to 150K characters.

Special note: substrings must appear in the correct order. So if we had the following string in addition to the above:

"ABC: {"Something": "aaa, ""UserName": "A111"}"

The result should be substrings that exist in all strings, in order. So:

["ABC: {"]