def input(st,default=None) :

    if default is None :
        default_str = ''
    else :
        default_str = ' [default: ' + default + ' ] '

    out = None
    while out is None :
        out = raw_input(white(bold(st))+default_str+white(bold(':'))+' \n')
        if len(out) == 0 :
            out = default

    return out
def wb(st) :
    sys.stdout.write(white(bold(st)))