#include "stdio.h"
int numReverse(int num){
int sum = 0;
while (num!=0){
sum = sum*10 + num%10;
num = num/10;
}
return sum;
}
int main(){
int num1,num2;int sum1,sum2;
while (scanf("%d%d",&num1,&num2)!=EOF){
sum1 = num1 + num2;
num1 = numReverse(num1);
num2 = numReverse(num2);
sum2 = num1 + num2;
if(sum1 == numReverse(sum2))
printf("%d\n",sum1);
else
printf("NO\n");
}
}

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