#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define CPU_CYCS 2100
#define MAX_BUF (1024*1024*1) //1m

#define ITERS_15US 125500
#define MULTIPLE 5

#define SPIN_ITERS (ITERS_15US*MULTIPLE)

__attribute__((optnone)) static void
wrk(void)
{
        unsigned int spin = 0;

        while (spin < SPIN_ITERS) {
                //__asm__ __volatile__("nop": : :"memory");
                spin++;
        }
}

//__attribute__((optnone)) int
int
main(void)
{
	char *d = malloc(MAX_BUF + 1);
	int r = read(0, d, MAX_BUF);

//	unsigned long long st = rdtsc(), en = 0;
//	wrk();
//	en = rdtsc();

//	if (r <= 0) printf("%llu\n", en > st ? (en - st)/CPU_CYCS : -1);
	if (r < 0)       printf("E\n");
	else if (r <= 1) printf("D\n");
	else             write(1, d, r);

	return 0;
}