#include <bits/stdc++.h>   using namespace std;   int main() {     string str;     int flag = 1;     cin >> str;     int len = str.size();     str[len] =  1 ;     str[len + 1] =  1 ;     for (int i = 0; i < str.size();) {       string temp =   ;       if (str[i] ==  1 ) {         temp = str[i + 1];         if (temp ==  4 ) {           temp += str[i + 2];           if (temp ==  44 ) {             i += 3;           } else {             i += 2;           }         } else {           i++;         }       } else {         flag = 0;         break;       }     }     if (flag)       cout <<  YES  << endl;     else       cout <<  NO  << endl;     return 0;   }   