C :

#include "stdio.h"
void plus(char a[],int la,char b[],int lb,char c[]){
  int i;
  int p=0,t=0;
  for (i=0;i<la;i++){
      
      p=a[la-i-1]-'0';
      p+=t;
      if(lb-i>=1)
        p+=b[lb-i-1]-'0';
      if (p>=10) {
         p=p-10;
         t=1;         
      }else{
         t=0;
      }
      c[i]=p+'0';
  }
  if (t) c[i++]='1';
  c[i]='\0';
}
void doplus(){
  char a[1000],b[1000],c[1000];
  int la,lb,i;
  scanf("%s%s",a,b);
  la=strlen(a);
  lb=strlen(b);
  if(la>lb){
    plus(a,la,b,lb,c);
  }else{
    plus(b,lb,a,la,c);
  }
  printf("%s + %s = ",a,b);
  for(i=strlen(c)-1;i>=0;i--)
      printf("%c",c[i]);
  printf("\n");
}
int main(){
#ifndef ONLINE_JUDGE
        FILE *f=freopen("in.txt","r",stdin);
#endif
  int n,i;
  scanf("%d",&n);
  for(i=0;i<n;i++){
    printf("Case %d:\n",i+1);               
    doplus();
    if(i<n-1)
    printf("\n");
  }
  return 0;
}