题解 | #点击消除#
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https://www.nowcoder.com/practice/8d3643ec29654cf8908b5cf3a0479fd5
import sys
stack = []
for line in sys.stdin:
line = line.strip() # 去除行末尾的换行符，否则换行符也算作一个字符导致栈不为空
for s in line:
if stack and stack[-1] == s:
stack.pop()
else:
stack.append(s)
if not stack:
print(0)
else:
for c in stack:
print(c, end="")
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