package main

import (
	"bufio"
	"encoding/hex"
	"fmt"
	"io"
	"os"

	"golang.org/x/crypto/sha3"
)

func main() {
	h := sha3.NewShake256()
	dgst := make([]byte, 64)
	var err error
	if _, err = io.Copy(h, bufio.NewReaderSize(os.Stdin, 1<<20)); err != nil {
		panic(err)
	}
	if _, err = io.ReadFull(h, dgst); err != nil {
		panic(err)
	}
	fmt.Println(hex.EncodeToString(dgst))
}