def minimumLoss(price):
    # Write your code here
    n = len(price)
    temp = {}
    for i in range(n):
        temp[price[i]] = i
        
        
    sorted_prices = sorted(price)
    minimum_loss = None
    for i in range(n-1):
        if temp[sorted_prices[i+1]] < temp[sorted_prices[i]]:
            loss = sorted_prices[i + 1] - sorted_prices[i]
            if not minimum_loss or loss < minimum_loss:
                minimum_loss = loss
    return minimum_loss