#include <stdio.h>

unsigned long long int reverse(int n){
	unsigned long long int revn=0;
	while(n){
		revn=revn*10+n%10;
		n/=10;
	}
	return revn;
}
int main(void) {
	// your code here
	int tc=0;
	scanf("%d",&tc);
	for(int i=0;i<tc;i++){
	unsigned long long int n1,n2;
		scanf("%llu%llu",&n1,&n2);
		printf("%llu\n",reverse(reverse(n1)+reverse(n2)));
	}
	return 0;
}