class L1metric(object):
    def __init__(self):
        pass

    def constructor(self, N, X):
        self.N = int(N)
        self.X = list(map(int, list(set(X))))
        if not len(self.X) > 1:
            print("0")
            exit() 

    def sort(self):
        self.X.sort()

    def run(self):
        self.sort()
        MinMetric = self.analysis()
        print(MinMetric)
    
    def analysis(self):
        MinMetric = 1e+5
        for num1, num2 in zip(self.X, self.X[1:]):
            metric = num2 - num1
            if metric < MinMetric:
                MinMetric = metric

        return MinMetric


if __name__=="__main__":
    N = input()
    X = input().split(" ")
    func = L1metric()
    func.constructor(N=N, X=X)
    func.run()