import sys
import csv
import json
import io

def main():
    # Reads the entire content from the 'Stdin' box
    input_data = sys.stdin.read().strip()
    
    if not input_data:
        print("[]")
        return

    # Treat the input string as a file for the CSV reader
    f = io.StringIO(input_data)
    reader = csv.DictReader(f)

    # Configuration for formatting
    int_fields = {
        "contest_level", "contestId1", "R1", "contestId2", "R2", 
        "contestId3", "R3", "contestId4", "R4"
    }
    
    # Fields where -1 or "null" should become actual JSON null
    time_fields = {"T1", "T2", "T3", "T4"}

    # The specific keys required by ThemeCP (removes performance, rating, etc.)
    required_keys = [
        "date", "topic", "contest_level", 
        "contestId1", "index1", "R1", 
        "contestId2", "index2", "R2", 
        "contestId3", "index3", "R3", 
        "contestId4", "index4", "R4", 
        "T1", "T2", "T3", "T4"
    ]

    json_data = []

    for row in reader:
        entry = {}
        for key in required_keys:
            # Get value from CSV, default to empty string if column missing
            val = row.get(key, "")
            
            # Convert to string to check contents
            str_val = str(val).strip()

            # 1. Handle Null/Empty/Negative-1 conditions
            if str_val.lower() == "null" or str_val == "-1" or str_val == "":
                entry[key] = None
            
            # 2. Handle Integer conversions
            elif key in int_fields or key in time_fields:
                try:
                    # Remove any quotes and convert to int
                    entry[key] = int(str_val.replace('"', ''))
                except ValueError:
                    entry[key] = str_val
            
            # 3. Handle Standard Strings (Date, Topic, Index)
            else:
                entry[key] = str_val.replace('"', '')

        json_data.append(entry)

    # Output the final JSON string to the 'Stdout' box
    print(json.dumps(json_data, indent=2))

if __name__ == "__main__":
    main()