#include <xxhash.h>
#include <unistd.h>
#include <cstdio>

int main()
{
	auto state = XXH3_createState();
	XXH3_128bits_reset(state);
	char buffer[1048576];
	ssize_t count;
	while ((count = read(STDIN_FILENO, buffer, sizeof(buffer))) > 0)
		XXH3_128bits_update(state, buffer, count);
	XXH128_canonical_t canon{};
	XXH128_canonicalFromHash(&canon, XXH3_128bits_digest(state));
	for (auto u : canon.digest)
		printf("%02x", u);
	printf("\n");
}