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es+=i
if i== 'B':
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if es=='':
pass
else:
es-es[:len(e
keyboard now has no other keys.
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Kartik uses a simple text editor which always displays the string that Kartik types, and the string is formatted as:
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return es
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14 print(displayScreen(s))
The O key: a letter O will be inserted to the right of the string.
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The 1 key: a letter 1 will be inserted to the right of the string.
The backspace key: if the string is empty, nothing happens. Otherwise, the rightmost letter of the string is deleted.
Kartik has launched the editor and pressed these keys several times. You are given a string s, a record of his keystrokes in order. In this string, the letter O stands for the 0 key, the letter 1 stands for the 1 key, and the letter B stands for the backspace key. Return the string which is displayed in the editor now
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