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#include<bits/stdc++.h>
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using namespace std;
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int main() {
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char str[100], stack[100];
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int i, len, mid, next, top;
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fgets(str, sizeof(str), stdin);
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len = strlen(str);
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mid = len / 2 - 1;//<2F><><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD>
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top = 0;//<2F><>ʼ<EFBFBD><CABC>ջ
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for (i = 0; i <= mid; i++) { //<2F><>midǰ<64><C7B0><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD>ѹ<EFBFBD><D1B9><EFBFBD><EFBFBD>ջ
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stack[++top] = str[i];
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}
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//<2F>ж<EFBFBD><D0B6>ַ<EFBFBD><D6B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ż<EFBFBD><C5BC><EFBFBD><EFBFBD><EFBFBD>Ծ<EFBFBD><D4BE><EFBFBD><EFBFBD><EFBFBD>Ҫƥ<D2AA><C6A5><EFBFBD>ĺ<EFBFBD><C4BA>벿<EFBFBD><EBB2BF><EFBFBD><EFBFBD>ʼ<EFBFBD>±<EFBFBD>
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next = (len % 2) ? (mid+2) : (mid+1);
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//<2F><>ʼƥ<CABC><C6A5>
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for (i = next; i <= len - 1; i++) {
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if (str[i] != stack[top]) break;
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top--;
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}
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//<2F><>֤<EFBFBD><D6A4><EFBFBD><EFBFBD>
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if (top == 0)
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printf("YES\n");
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else
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printf("No\n");
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return 0;
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}
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