>>559
#include <iostream>
#include <algorithm>
#include <iterator>

const char *tr(char c)
{
    switch(c)
    {
    case 'a': case 'c': case 'f':
        return "×";
    default:
        return "◯";
    }
}

int main(void)
{
    typedef std::istream_iterator<char> ii;
    std::transform(ii(std::cin), ii(), std::ostream_iterator<const char *>(std::cout), tr);