# include<iostream> # include<cstring> using namespace std; string s; bool hui(int l,int r){ for(int k=0;k<(r-l+1)/2;k++) { if(s[l-k]!=s[r-k]) return false; } return true; } int main(){ cin>>s; int len=s.size(); for(int i=0;i<len-1;i++){ for(int j=len-1;j>i+1;j--){ if(hui(i,j)) { cout<<"Yes"; return 0; } } } cout<<"No"; return 0; }