A. Life Without Zeros

#include <bits/stdc++.h>

using namespace std ;
#define sz(s) int(s.size())
typedef long long ll ;


void ABDEL3AL () {
    ios_base::sync_with_stdio(false); cin.tie(nullptr) , cout.tie(nullptr) ;
    #ifndef ONLINE_JUDGE
    freopen("input.txt" , "r" , stdin) , freopen("output.txt" , "w" , stdout) ;
    #endif

}

int main() {
    ABDEL3AL() ;
    string a , b , c ;
    cin >> a >> b ;
    c = to_string(stoi(a) + stoi(b)) ;
    a.erase(remove(a.begin() , a.end() , '0')) ;
    b.erase(remove(b.begin() , b.end() , '0')) ;
    c.erase(remove(c.begin() , c.end() , '0')) ;
    cout << (stoll(a) + stoll(b) == stoll(c) ? "YES" : "NO") ;
    return 0;
}