#!/usr/bin/env python3
# Convert input to hexadecimal.
import argparse
import sys

parser = argparse.ArgumentParser()
parser.add_argument("-a", metavar="STRING", help="input text")
args = parser.parse_args()

if args.a is not None:
    sys.stdout.write(args.a.encode().hex())

else:
    while hasattr(sys.stdin, "encoding"):
        sys.stdin = sys.stdin.detach()

    while buf := sys.stdin.read(4096):
        sys.stdout.write(buf.hex())
