#include <iostream>
#include <string>
#include <cstdio>

using namespace std;

int main()
{
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);

    string S, S1 = "", S2 = "", S3;
    getline(cin, S);

    for (int i = 0; i < S.size(); ++i) {
        S2 = S[i];
        if (S2 != " ") {
            S1 += S2;
        }
    }

    S2 = "";

    for (int i = S.size() - 1; i >= 0; --i) {
        S3 = S[i];
        if (S3 != " ") {
            S2 += S3;
        }
    }

    if (S1 == S2) {
        cout << "YES";
    }
    else {
        cout << "NO";
    }

    return 0;
}