#include<stdio.h>
#include<stdlib.h>

int main()
{
    int t;
    scanf(" %d",&t);
    while(t--)
    {
        char* num1 = (char*)malloc(18);
        char* num2 = (char*)malloc(18);
        scanf(" %s %s",num1,num2);
        int len1,len2,i;
        for(len1=0;num1[len1];len1++);
        for(len2=0;num2[len2];len2++);

        for(i=0;i<len1/2;i++)
        {
            char temp = num1[i];
            num1[i] = num1[len1-i-1];
            num1[len1-i-1] = temp;
        }
        for(i=0;i<len2/2;i++)
        {
            char temp = num2[i];
            num2[i] = num2[len2-i-1];
            num2[len2-i-1] = temp;
        }
        int right1=len1-1,right2=len2-1;
        char* ans = (char*)malloc(19);
        int k = 0,carry=0;
        while(right1>=0 && right2>=0)
        {
            ans[k++] = (num1[right1]-'0'+num2[right2]-'0'+carry)%10+'0';
            carry = (num1[right1]-'0'+num2[right2]-'0'+carry)/10;
            right1--;right2--;
        }
        while(right1>=0)
        {
            ans[k++] = (num1[right1]-'0'+carry)%10 + '0';
            carry = (num1[right1]-'0'+carry)/10;
            right1--;
        }
        while(right2>=0)
        {
            ans[k++] = (num2[right2]-'0'+carry)%10 + '0';
            carry = (num2[right2]-'0'+carry)/10;
            right2--;
        }
        if(carry)
            ans[k++] = carry + '0';
        ans[k]=0;
        unsigned long long n1;
        //sscanf(num1,"%ull",&n1);
        sscanf(ans,"%llu",&n1);
        printf("%llu\n",n1);

    }
}