#include <iostream>
#include <string>
 
using namespace std;
 
int main() {
    string str_input;
    cin >> str_input;
 
    if (str_input.length() < 6) {
        cout << "Invalid input" << endl;
        return 1;
    }
 
    int saleh = 0;
    int moayed = 0;
 
    for (int i = 0; i < 3; i++) {
        saleh += int(str_input[i]);     
        moayed += int(str_input[i+3]);  
    }
 
    if (saleh == moayed) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
 
    return 0;
}
 

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