#include<iostream> #include<cstring> #include<cmath> using namespace std; string a; bool FUM(int left,int right) { int len = (right - left + 1)/2; for(int i=0;i<len;i++){ if(a[left + 1 != a[right - i]]) return false; } return true; } int main(){ cin>>a; int len = a.length(); for(int i=0;i<len - 1;i++){ for(int j=len - 1;j>i;j--){ if(FUM(i,j)&&(j-i != 1)){ cout<<"Yes"<<endl; return 0; } } } cout<<"No"<<endl; return 0; }