#include<iostream>
using namespace std ;
int main(){
    string s1,s2;
    int a;
    if(!(cin>>s1>>s2)){
        cout<<"Invalid input";
        return 0;
    }
    esle{
        if(s1.length()<1||s1.length()>100){
            cout<<"Invalid input";
        }
        else if(s1.length()!=s2.length()){
            cout<<"Invalid input";
        }
        else{
            a=s1.length();
            for(int i=0;i<s1.length();i++){
                if(s1[a-1]!=s2[a-3]){
                    cout<<"false";
                    return 0;
                }
                else{
                    cout<<"true";
                    return 0;
                }
            }
        }
    }
}