欢乐赛#53 T3

#include<bits/stdc++.h>
using namespace std;
int main(){
    string a;
    int n,sum=0;
    getline(cin,a);
    cin>>n;
    int len=a.size()-1;
    for(int i=0;i<a.size();i++){
        if(a[i]>='A' and a[i]<='Z')a[i]+=32;
    }for(int i=0;i<a.size();i++,len--){
        if(a[i]!=a[len])sum++;
    }if(sum<=n)cout<<"YES";
    else cout<<"NO";
    return 0;
}