#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#define BFSIZE 30000

void fuck(int f) {
	char c;
	
	do read(f, &c, 1);
	while(c != ']');	
}

void brain(int f, char v[], int *i) {
	int fp;
	char c;
	
	while(read(f, &c, 1)) {
		switch(c) {
			case '+':
				v[*i]++;
				break;
			case '-':
				v[*i]--;
				break;
			case '>':
				(*i)++;
				break;
			case '<':
				(*i)--;
				break;
			case ',':
				v[*i] = getchar();
				break;
			case '.':
				putchar(v[*i]);
				break;
			case '[':
				fp = lseek(f, 0, SEEK_CUR) - 1;
				if(v[*i] == 0) fuck(f);
				else {
					brain(f, v, i);
					lseek(f, fp, SEEK_SET);
				}
				break;
			case '0':
			case ']':
				return;
			default:
				break;
		}
	}
}

int main(int argc, char *argv[]) {
	char v[BFSIZE];
	int f, i = 0;

	if(argc != 2) {
		printf("Usage: %s file\n", argv[0]);
		return 1;
	}
	
	bzero(v, BFSIZE);
	if((f = open(argv[1], O_RDONLY, 0)) < 0) {
		perror("open");
		return 1;
	}
	
	brain (f, v, &i);
	return 0;
}