#include <bits/stdc++.h>
using namespace std;
long long qitaceruts(long long num) {
  long long n = 0, d, p = 1;
  while (num > 0) {
    d = num % 10;
    num = num / 10;
    if (d != 0) {
      n = (d * p) + n;
      p *= 10;
    }
  }
  return n;
}
int main() {
  long long a, b, c1, c2;
  cin >> a >> b;
  c1 = a + b;
  a = qitaceruts(a);
  b = qitaceruts(b);
  c1 = qitaceruts(c1);
  if (a + b == c1) {
    cout << "YES\n";
  } else {
    cout << "NO\n";
  }
  return 0;
}
