class Rat:
    def __init__(self,a=0,b=1):
        if(b!=0):
            self.num=a
            self.den=b
        else:
            self.num=a
            self.den=1
    def __str__(self):
        return str(self.num)+"/"+str(self.den)
    def check(self):
        if den==0: return False
        return True

    def reduce(self):
        n=self.num
        m=self.den
        if n > m:
            k = n
        else:
            k = m
        while k != 1:
            if n % k == 0 and m % k == 0:
                return n // k, m // k
            else:
                k -= 1
        return Rat(n,m)


if __name__=="__main__":
    t=Rat(25,5)
    print(t.reduce())