#include <iostream>
using namespace std;
int main()
{
    char c;
    int a , b;
    cin >> c;
    int k = int(c);
    if (k % 2 == 1) cout << "YES";
    else cout << "NO";
    return 0;
}

#include<iostream> 
#include<cstdio> 
#include<cmath> 
#include<algorithm>
using namespace std;
int main(){
	int a;
	char c;
	cin >> c;
	a = c;
	if (a%2 == 1){
		cout << "YES";
	}else{
		cout << "NO";
	}
	return 0;
}

#include <iostream>
using namespace std;
int main()
{
    char c;
    int a , b;
    cin >> c;
    if (c % 2 == 1) cout << "YES";
    else cout << "NO";
    return 0;
}

#include<iostream>
using namespace std;
int y;
char j;
int main(){
    cin>>j;y=j;
    if(y%2==1) cout<<"YES";
    else cout<<"NO";
    cout<<endl;return 0;
}

https://www.luogu.com.cn/record/65861815

#include <bits/stdc++.h>
using namespace std;
int main()
{
    char a;
    cin>>a;
    if((int)a%2==0) cout<<"NO"; else cout<<"YES";
    return 0;
}