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def ZeroSum(myList):
    numPairs=0
    uniqueList=[]
    for i in range(len(myList)):
        if myList[i]*-1 in myList and abs(myList[i]) not in uniqueList:
            numPairs+=1
            uniqueList.append(abs(myList[i]))
    
    return numPairs


def main():
    print("Enter a list of integers separated by spaces (e.g., 1 2 3 4):")
    user_input = input("> ")
    
    try:
        # Convert the input string into a list of integers
        numbers = list(map(int, user_input.strip('[]').split(',')))
        
        # Call the function with the list of integers
        result = ZeroSum(numbers)
        
        print(f"The result of the ZeroSum is: {result}")
        
    except ValueError:print("Invalid input. Please ensure the format is correct, e.g., [1,10,8,3,2,-2].")


if __name__ == "__main__":
    main()