#include <iostream>
using namespace std;
void checkEquation(const string &equation) {
int a = equation[0] - '0';
int b = equation[4] - '0';
int c = equation[8] - '0';
if (a + b == c) {
cout << "YES" << endl;
} else {
cout << "NO" << endl;
}
}
int main() {
string equation;
cin >> equation;
checkEquation(equation);
return 0;
}
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