import sys
#   Read a file specified by the first command line argument.
#   Print the number of characters in the file and then the file itself.

if len(sys.argv) < 2:
    print("Usage: sum_number.py <filename>")
    sys.exit(1) # Exit with an error code

filename = sys.argv[1]

try:
    with open(filename, mode="r") as f:
        """
        sum = 0
        for line in f:
            sum += int(line)
        """
        sum = 0
        lines = f.readlines()
        for line in lines:
            sum += int(line) 
        print(f"total sum is {sum}.")
        print(f"There are {len(lines)} numbers.")
except FileNotFoundError:
    print(f"The file {filename} cannot be found.")
    sys.exit(1)
except Exception as e:
    print(f"An error occurred: {e}")