import readline

def convert_to_number(numerals: str) -> str:
    filtered = list(filter(lambda x: x in "IVXCM", list(numerals.upper())))
    if len(filtered) == 0:
        return "ERROR: Invalid input"

    values: list[int] = []
    for i in range(len(filtered)):
        match filtered[i]:
            case "I":
               values.append(1)
            case "V":
                values.append(5)
            case "X":
                values.append(10)
            case "C":
                values.append(100)
            case "M":
                values.append(1000)
    
    if len(values) > 1:
        return f"{''.join(filtered)} = {' + '.join(str(v) for v in values)} = {sum(values)}"
    else:
        return f"{''.join(filtered)} = {values[0]}"
    
def main():
    while True:
        try:
            numerals = input("Please enter some Roman numerals: ")
            print(convert_to_number(numerals))
        except (EOFError, KeyboardInterrupt):
            break

if __name__ == "__main__":
    main()