7-3 sdut-分数加减法

from fractions import Fraction as F

while True:
    try:
        a = input()
        if a.find('+')!=-1:
            ls = a.split('+')
            print(F(ls[0]) + F(ls[1]))
        elif a.find('-')!=-1:
            ls = a.split('-')
            print(F(ls[0]) - F(ls[1]))
        elif a.find('*')!=-1:
            ls = a.split('*')
            print(F(ls[0]) * F(ls[1]))
        else:
            ls = a.split('\\')
            print(F(ls[0]) / F(ls[1]))

    except:
        break