Untitled

#include <iostream>
#include <cmath>
using namespace std;

int main() {

    int a;
    bool Near = false;


    cin >> a;

    int last_number = a % 10;
    a /= 10;

    while (a != 0) {
        if (last_number == a % 10) {
            Near = true;
            break;
        }
        else {
            last_number = a % 10;
            a /= 10;
        }
    }
    if (Near) {
        cout << "YES";
    }
    else {
        cout << "NO";
    }
}