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#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main() {
    string s;
    cin >> s;
    if (abs(s[0]-s[3])==2 and abs(int(s[1]-s[4]))==1 or abs(s[0]-s[3])==1 and abs(int(s[1]-s[4])==2)) cout << "YES";
    else if (s.size()!=5 or s[0]<'A' or s[0]>'H' or s[1]<'1' or s[1]>'8' or s[2]!='-'
    or s[3]<'A' or s[3]>'H' or s[4]<'1' or s[4]>'8') cout << "ERROR";
    else cout << "NO";
}