#include<bits/stdc++.h>
using namespace std;
// write your code here......

void swap(char &a, char &b) {
    char temp = a;
    a = b;
    b = temp;
}

void reverseString(string &str) {
    int left = 0;
    int right = str.length() - 1;

    // 交换字符串中对应位置的字符, 直到左右指针相遇
    while (left < right) {
        swap(str[left], str[right]);
        left++;
        right--;
    }
}


int main(){
    string s;
    getline(cin,s);
    // write your code here......
    reverseString(s);

    cout<<s;
    return 0;
}