c[99];d[9];*p=d;n;char*q;main(i){for(read(0,q=c,d);i=*q;n<0?q--:q++)i-93?i-91?n?0:i-46?p+=i-60&~2?*p-=i-44,0:i-61:putchar(*p):(n+=!!n)|*p||n++:n--;}