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def findMostPopularTopic(postDetails):
    topics = set()
    topic_scores = {}

    for line in postDetails:
        parts = [part.strip() for part in line.split(',')]
        if len(parts) != 5:
            print("Invalid input")
            return
        
        try:
            likes = int(parts[2])
            comments = int(parts[3])
            shares = int(parts[4])
        except ValueError:
            print("Invalid input")
            return
        
        if likes < 0 or comments < 0 or shares < 0:
            print("Invalid input")
            return
        
        topic = parts[1]
        topics.add(topic)
        
        engagement = likes + comments * 2 + shares * 5
        if topic in topic_scores:
            topic_scores[topic] += engagement
        else:
            topic_scores[topic] = engagement
    
    if len(topics) < 2:
        print("Invalid input")
        return
    
    max_score = -1
    max_topic = ''
    for topic, score in topic_scores.items():
        if score > max_score:
            max_score = score
            max_topic = topic
    print(max_topic)

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