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

#define tonum(x) ((x)<='9' ? ((x)-'0') : ((x)-'A'+10))
#define tochar(x) *((char *)"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"+x)

char x[1001];
char y[1001];
char xx[1001];
char yy[1001];
char v[1001];
int l;
int l2;
int m;
int i;
int p;

int main()
{
	int z;
	for (;;)
	{
		scanf("%d\n",&z);
		if(z==0)
			break;
			
		scanf("%s %s\n",x,y);
		printf("%s + %s = ",x,y);
		
		if(x[0]=='0')
		{
			printf("%s\n",y);
			continue;
		} else if(y[0]=='0')
		{
			printf("%s\n",x);
			continue;
		}
		
		if(z==1)
		{
			printf("%s%s\n",x,y);
			continue;
		}
		
		l=strlen(x);
		l2=strlen(y);
		m=(l>l2 ? l : l2)+1;
		memset(xx,'0',1000);
		memset(yy,'0',1000);
		strcpy(xx+m-l,x);
		strcpy(yy+m-l2,y);
		
		v[m]=0;		
		for(i=m-1,p=0;i>=0;i--)
		{
			int n=tonum(xx[i])+tonum(yy[i])+p;
			v[i]=tochar(n%z);
			p=n>=z ? 1 : 0;
		}

		printf("%s\n",v[0]=='0' ? v+1 : v);
	}
	return 0;
}