import java.util.*;
class A {
public static void main
(String[] args
) { Scanner s
= new Scanner
(System.
in); String a
= s.
next(), b
= s.
next(); int x
= new Integer(c.
replaceAll("0",
"")); int y
= new Integer(a.
replaceAll("0",
"")) + new Integer(b.
replaceAll("0",
"")); System.
out.
println((x
==y
)?"YES":"NO"); }
}
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