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32 lines
699 B
32 lines
699 B
#include <bits/stdc++.h>
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using namespace std;
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int main() {
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//输入+输出重定向
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//freopen("../x.in", "r", stdin);
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//freopen("../x.out", "w", stdout);
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string s;
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cin >> s;
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stack<int> Stack;
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for (int i = 0; i < s.size() / 2; ++i) {
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Stack.push(s[i]);
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}
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bool isHuiWen = true;
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for (int i = s.size() / 2 + 1; i < s.size(); ++i) {
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char c = Stack.top();
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Stack.pop();
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if (s[i] != c) {
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isHuiWen = false;
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break;
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}
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}
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if (isHuiWen)cout << "yes" << endl;
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else cout << "no" << endl;
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//关闭文件
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//fclose(stdin);
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//fclose(stdout);
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return 0;
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}
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