688B - Lovely Palindromes - CodeForces Solution

#include<bits/stdc++.h>

using namespace std;
#define ll int64_t



int main(){
ios_base :: sync_with_stdio(false);
cin.tie(NULL);


    string s;
    cin>>s;
    string k=s;
    reverse(k.begin(),k.end());
    s=s+k;
    cout<<s<<endl;
    


return 0;
}