#include<iostream>
#include<string>
using namespace std;
int main()
{
    int m=0;
    while(cin>>m)
    {
        string a,b;
        int i=0;
        for(i=1;i<=m;++i)
        {
            cin>>a>>b;
            cout<<"case"<<i<<":"<<endl;
            int n1=a.length(),n2=b.length();
            int n=n1>=n2?(n1+1):(n2+1);
            int *c=new int[n];
            int j=0,sum=0,flag=0;
            --n1;
            --n2;
            while(n1>=0&&n2>=0)
            {
                sum=a[n1--]-'0'+b[n2--]-'0'+flag;
                flag=sum>=10?1:0;
                c[j++]=sum%10;
            }
            while(n1>=0)
            {
                sum=a[n1--]-'0'+flag;
                flag=sum>=10?1:0;
                c[j++]=sum%10;
            }
            while(n2>=0)
            {
                sum=b[n2--]-'0'+flag;
                flag=sum>=10?1:0;
                c[j++]=sum%10;
            }
            c[n-1]=flag;
            cout<<a<<" + "<<b<<" = ";
            if(c[n-1]==1)
               cout<<1;
            for(int j=n-2;j>=0;--j)
            {
                cout<<c[j];
            }
            cout<<endl<<endl;
            delete []c;
        }
    }
}