gistfile1.txt

import java.math.BigInteger;
import java.util.Scanner;

public class RationalRatio {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String[] s = sc.nextLine().split(" ");
        int repeating_digits = Integer.parseInt(s[1]);

        String[] split = s[0].split("\\.");
        int diff = split[1].length() - repeating_digits;

        BigInteger numerator = new BigInteger(split[0] + split[1]);

        StringBuilder sub = new StringBuilder(split[0]);
        for (int i = 0; i < diff; i++) {
            sub.append(split[1].charAt(i));
        }
        numerator = numerator.subtract(new BigInteger(sub.toString()));

        StringBuilder sb = new StringBuilder("1");
        for (int i = 0; i < split[1].length(); i++) {
            sb.append("0");
        }
        StringBuilder temp = new StringBuilder("1");
        for (int i = 0; i < diff; i++) {
            temp.append("0");
        }
        BigInteger dem = new BigInteger(sb.toString());
        dem = dem.subtract(new BigInteger(temp.toString()));

        while (gcd(numerator, dem) != 1) {
            long gcd = gcd(numerator, dem);
            numerator = numerator.divide(new BigInteger(String.valueOf(gcd)));
            dem = dem.divide(new BigInteger(String.valueOf(gcd)));
        }

        System.out.println(String.format("%d/%d", numerator, dem));

    }

    public static int gcd(BigInteger a, BigInteger b) {
        BigInteger gcd = a.gcd(b);
        return gcd.intValue();
    }
}