#000099

z-easy

You are given two rational numbers in the form a/b, where (1 <= a,b <= 1000000000). You have to find the sum of the two rational numbers and output the result in the reduced form. A rational number a/b is in the reduced form if a and b do not have any common integer dividers - we can not divide both a and b with the same integer greater than 1


InputThe first of the standard input contains the two rational numbers a/b and []/d, separated by a single space.

OutputOn the standard ouput you should print out the sum of the two rational numbers, in its reduced form.

Input:
[c]1/2 1/6

Output:
2/3


Input:
1/4 1/6
Output:
5/12

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