#include<bits/stdc++.h>
#include<string.h>

using namespace std;
int main()
{
    string st,str,rs;
    cin>>st>>str;
    reverse(str.begin(),str.end());
    rs=str;

    if(strcmp(st,rs))
    {
        cout<<"YES"<<endl;
    }
    if(!strcmp(st,rs))
    {
        cout<<"NO"<<endl;
    }

    return 0;
}