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https://www.nowcoder.com/practice/8d3643ec29654cf8908b5cf3a0479fd5
def optimize_delete(s):
stack = []
for char in s:
if not stack or stack[-1] != char:
stack.append(char)
else:
stack.pop()
return '0' if not stack else ''.join(stack)
s = input()
print(optimize_delete(s))
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