# include<stdio.h> # include<iostream> using namespace std; int main(){ char s[1000]; int i,n,flag=1; cin>>s>>n; for(i=0;i<=n/2;i++){ if(s[i]!=s[n-1-i]){ flag=0; break; } } if(flag) cout<<'YES'<<endl; else cout<<'NO'<<endl; return 0; }