#include <stdio.h>
int gcd(int a,int b)
{
	return b==0?a:gcd(b,a%b);
}
int main()
{
	int a,b,c,d,m,n,s;
	char op;
	while(scanf("%d/%d%c%d/%d",&a,&b,&op,&c,&d)!=EOF)
	{
		m=b*d/gcd(b,d);
		a=a*(m/b);
		c=c*(m/d);
		switch(op)
		{
		case'+':
			n=a+c;
			s=gcd(m,n);
			if(s==m)
			printf("%d\n",n/s);
			else
			printf("%d/%d\n",n/s,m/s);
			break;
		case'-':
			if(a<c)
			{
			printf("-");
			n=c-a;
			s=gcd(m,n);
			if(m==s)
			printf("%d\n",n/s);
			else
			printf("%d/%d\n",n/s,m/s);
			break;
			}
			else
			if(a==c)
			{
				printf("0\n");
				break;
			}
			else
			{
				n=a-c;
				s=gcd(m,n);
				if(m==s)
				printf("%d\n",n/s);
				else
				printf("%d/%d\n",n/s,m/s);
				break;
			}
		}
	}
	return 1;
}