using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(new Factor(10,10).Reduce());

        Console.WriteLine(new Factor(3,4).Reduce());

    }

}

​

public class Factor

{

    private int _nominator;

    private int _denominator;

    public Factor(int nominator, int denominator)

    {

        _nominator = nominator;

        _denominator = denominator;

    }

    public Factor Reduce()

    {

        if(_nominator == _denominator) return new Factor(1,1);

        return new Factor(_nominator, _denominator);

    }

    public override string ToString()

    {

        return string.Format("{0}/{1}", _nominator, _denominator);

    }

}