#include <stdio.h>

#define DIVISOR 30

int main() {
	int index = 0, last = 0, direction = 1, syncstate = 0, bitindex = 0;
	int distance;
	unsigned char outbyte;
	signed short sample;

	while (!feof(stdin)) {
		sample = getchar() | getchar()<<8; 
		if (!direction) {
			if (sample>(32768/DIVISOR)) {
				distance = index-last;
				if (distance<50) {
					if (syncstate == 2) {
						outbyte = outbyte << 1 | (distance<32? 0:1);
						if (!((++bitindex)&7)) putchar(outbyte);
					}
					if (syncstate == 1) syncstate++;
				} else if ((distance<70) && !syncstate)
					syncstate++;
				last = index;
				direction++;
			}
		} else
			if (sample<-(32768/DIVISOR))
				direction--;
		index++;
	}
		
	return bitindex/8;
}