# include<iostream> # include<cstring> using namespace std; bool b(string a,int l,int r){ int lenn=r-l; for(int i=0;i<lenn/2;i++){ if(a[l+i]!=a[r-i-1]){ return false; } } return true; } int main(){ string x; cin>>x; int lenn=x.size(); for(int l=0;l<=lenn-3;l++){ for(int r=l;r<=lenn;r++){ if(x[l]==x[r-1]&&r-l>=2&&b(x,l,r)){ cout<<"Yes"; return 0; } } } cout<<"No"; return 0; }