1
#include <bits/stdc++.h>
2
 
3
using namespace std;
4
 
5
int main() {
6
    char x;
7
    cin >> x;
8
    if (isdigit(x)) {
9
        cout << "YES";
10
    } else {
11
        cout << "NO";
12
    }
13
    return 0;
14
}