#include <bits/stdc++.h>   long long RemoveZeros(long long a) {     long long temp;     long long x = 0;     long long i = 10;     while (a > 0) {       if (a % 10 != 0) {         temp = (a % 10) * i;         x += temp;         i *= 10;       }       a /= 10;     }     return x / 10;   }   using namespace std;   int main() {     long long a, b, c;     cin >> a >> b;     c = a + b;     long long a1 = RemoveZeros(a);     long long b1 = RemoveZeros(b);     long long c1 = RemoveZeros(c);     if (a1 + b1 == c1)       cout <<  YES ;     else       cout <<  NO ;     return 0;   }   