11.string

#include <bits/stdc++.h>
using namespace std;
int main(){
    /* 
        string -> 字串 -> 很多字元(char)
        ex. string s = "abcde";
            string s2 = "123456789"
        s[0] = 'a'
        s[4] = 'e'
        s2[0] = '1'
        s2[8] = '9'
    */
    string s;
    cin >> s;
    int len = s.length();
    for(int i = len - 1; i >= 0; i--)
        cout << s[i];
    cout << endl;
    return 0;
}