#include<bits/stdc++.h>
using namespace std;
int a,b,v=0,c=0,sum=0,su=0;
string s="",z="",d="",r="";
int main(){
cin>>a>>b;
sum=a+b;
s=to_string(a);
z=to_string(b);
for(int i=0;i<s.length();i++){
if(s[i]=='0')
continue;
else
d+=s[i];
}
v=atoi(d.c_str());
for(int i=0;i<z.length();i++){
if(z[i]=='0')
continue;
else
r+=z[i];
}
c=atoi(r.c_str());
su=v+c;
if(sum!=su){
cout<<"YES";
}else
cout<<"NO";
}
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