def solve(self, cipher):
        a, b, x, y = cipher
        if self.gcd(a, b) == self.gcd(x, y):
            return "YES"
        else:
            return "NO"
Returns formatted percent value for the current locale. Example::
dataset/ETHPy150Open algorhythms/HackerRankAlgorithms/Possible Path.py/Solution.solve--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/webapp2-2.3/webapp2_extras/i18n.py/I18n.format_percent