#include <stdio.h>
#include <string.h>

int main()
{
  int i,j;
  char cisla[255];
  char znaky[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

  j=0;
  for ( i = (int)'0'; i <= (int)'9'; i++, j++ )
    cisla[i] = j;
  j = 10;
  for ( i = (int)'A'; i < (int)'Z'; i++, j++)
    cisla[i] = j;
  
  int zaklad, lenA, lenB;
  char strA[1005];
  char strB[1005];
  char vysledek[1007];
  char * manA, *manB;
  for ( ; ; )
  {
    scanf( "%d", &zaklad );
    if ( zaklad == 0 ) break;
    scanf( "%s %s", strA, strB );
    lenA = strlen(strA); lenB = strlen(strB);
//    printf ( "lenA: %d\nlenB: %d\n", lenA, lenB );
    if ( zaklad == 1 )
    {
      int pocet1 = (( strA[0] != '0' )? lenA : 0 ) + ( (strB[0] != '0')? lenB : 0 );
      if ( pocet1 )
      {
        for ( int k = 0; k < pocet1; k++ )
	  vysledek[k] = '1';
	vysledek[pocet1] = '\0';
      }
      else
      {
        vysledek[0] = '0';
	vysledek[1] = '\0';
      }
      printf( "%s + %s = %s\n", strA, strB, vysledek );
      continue;
    }
    if ( lenA < lenB )
    {
      int x = lenA; lenA = lenB; lenB = x;
      manB = (char*)strA; 
      manA = (char*)strB; 
    }
    else
    {
      manB = strB;
      manA = strA;
    }
    
    int posA = lenA-1, posB = lenB-1, posV = 1003;
    int soucet=0, prenos=0, soucetcifer;
    vysledek[1004] = '\0';
//    printf( "manA: %s\nmanB: %s\n", manA, manB );
    while ( posB >= 0 )
    {
      soucetcifer = prenos + cisla[manA[posA]] + cisla[manB[posB]];
      prenos = soucetcifer / zaklad;
      soucet = (soucetcifer % zaklad);
      vysledek[posV] = znaky[soucet];
//      printf( "soucetcifer: %d\nprenos: %d\nsoucet: %d\n", soucetcifer, prenos, soucet );
//      printf( "posv: %d", posV );
//      printf( "vysledek: %s", vysledek + posV );
      posB--; posA--; posV--;
    }
    while ( posA >= 0 )
    {
      soucetcifer = prenos + cisla[manA[posA]];
      prenos = soucetcifer / zaklad;
      soucet = soucetcifer % zaklad;
      vysledek[posV] = znaky[soucet];
      posA--; posV--;
    }
    if ( prenos ) vysledek[posV] = znaky[prenos];
    else posV++;
    printf( "%s + %s = %s\n", strA, strB, vysledek+posV );
  }
  return 0;
}