#include <stdio.h>
int main() {
	int a, b, c, d;
	char m;
	while (scanf("%d/%d%c%d/%d", &a, &b, &m, &c, &d) != EOF) {
		if (m == '+') {
			int zi = a * d + b * c;
			int mu = b * d;
			int p, q;
			int g = mu, temp;
			int x = zi;
			while (x != 0) {
				temp = g % x;
				g = x;      //辗转相除算最大公约数
				x = temp;
			}
			p = zi / g;
			q = mu / g;
			if (q < 0) {
				p = -p;
				q = -q;
			}
			if (q == 1) {
				printf("%d\n", p);//特例，分母为1时
			} else {
				printf("%d/%d\n", p, q);
			}
		} else if (m == '-') {
			int zi = a * d - b * c;
			int mu = b * d;
			int mu1;
			int flag = 1;
			if (zi < 0) {
				mu1 = -zi;
				flag = 0;
			} else {
				mu1 = zi;
				flag = 1;
			}
			int g = mu, temp;
			int x = mu1;
			while (x != 0) {
				temp = g % x;
				g = x;       //同样的辗转相除
				x = temp;
			}
			int p = zi / g;
			int q = mu / g;
			if (q < 0) {
				p = -p;
				q = -q;
			}
			if (p == 0) {
				printf("0\n");
			} else {
				printf("%d/%d\n", p, q);
			}

		}
	}
}