import sys, itertools

def open_arg(_arg0, filename = "-"): # Default of - means stdin
    if filename == "-":
        return sys.stdin

    return open(filename, 'r')

def head(file):
    for line in file.readlines()[:10]:
        print(line, end = "")

if __name__ == '__main__':
    try:
        file = open_arg(*sys.argv)
        head(file)
    except FileNotFoundError:
        print("File not found!", file=sys.stderr)
        sys.exit(1)
    except:
        print("Some other error occured", file=sys.stderr)