#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main ()
{
    string s;
    cin >> s;
    int i, j, k, l, x, y;
    int sz = s.size();
    s[0]=s[0]--;
    if (s[0]=='0')
    {
        cout << 1;
        for (i=1; i<sz; i++)
        {
            cout << s[i];
        }
        for (i=sz-1; i>=1; i--)
        {
            cout << s[i];
        }
        cout << 1;
    }
    else
    {
        for (i=0; i<sz; i++)
        {
            cout << s[i];
        }
        for (i=sz-1; i>=0; i--)
        {
            cout << s[i];
        }
    }
    return 0;
}
close