from math import gcd

fnumerator, fdenominator = map(int, input().split("/"))

cnumerator = fnumerator - (fdenominator * 32)
negative = cnumerator < 0
cnumerator = abs(cnumerator)
cnumerator *= 5
cdenominator = fdenominator * 9

gcdiv = gcd(cnumerator, cdenominator)
print("-" if negative else "", end="")
print(f"{cnumerator//gcdiv}/{cdenominator//gcdiv}")