不愧是我

#include <bits/stdc++.h>
#define io freopen("in.txt", "r", stdin), freopen("out.txt", "w", stdout)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
string s;
int leftn, rightn;
bool flag;
void program(){
    getline(cin, s);
    leftn = 0;
    rightn = s.length() - 1;
    while(leftn < rightn){
        if(s[leftn] != s[rightn]){
            flag = false;
            cout << "No" << endl;
            exit(0);
        }
        leftn++;
        rightn--;
    }
    flag = true;
    cout << "Yes" << endl;
}
int main(){
    program();
    return 0;
}