import sys

def calculate_average(input_file, column_index):
    total = 0
    count = 0

    with open(input_file, 'r') as f:
        for line in f:
            columns = line.strip().split(',')
            if len(columns) > column_index:  
                try:
                    value = float(columns[column_index])  
                    total += value
                    count += 1
                except ValueError:
                    print(f"error value: {columns[column_index]}")

    if count > 0:
        average = total / count
        print(f"list {column_index + 1} average: {average}")
    else:
        print("no value")

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print(" python calculate_average.py input_file column_index")
    else:
        input_file = sys.argv[1]
        column_index = int(sys.argv[2]) - 1 
        calculate_average(input_file, column_index)