#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
string s;
cin >> s;
for (int i = 0; i < s.size(); i ++ )
{
if(s[i] == 'I' || s[i] == 'O' || s[i] == 'S' || s[i] == 'H' || s[i] == 'Z' || s[i] == 'X' || s[i] == 'N')
{
}else
{
puts("NO");
return 0;
}
}
puts("YES");
return 0;
}