Take and delete a String from another String

I have original input string= 111100001111
I need to Take for example the least 4 bits .... Output= 1111
and to be removed from the original input string so the original input string= 11110000 
I am trying to make a generic one but the point is that I can not delete subset that I take from the original input String.  
How can I take and delete from a string in the same time? 
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