template < typename my_type > class Set {
Boolv vector;
public:
Set()
{
    vector=Boolv(256);
}
Set(int n)
{
    vector=Boolv(n);
}
Set (const Set &a)
{
    vector=a.vector;
}
Set <my_type> operator |=(const Set <my_type> &a)
{
    vector |=a.vector;
    return *this;
}
Set <my_type> operator |(const Set <my_type> &a)
{
    Set <my_type> t;
    t.vector =vector|a.vector;
    return t;
}
Set <my_type> operator ^=(const Set <my_type> &a)
{
    vector ^=a.vector;
    return *this;
}
Set <my_type> operator ^(const Set <my_type> &a)
{
    Set <my_type> t;
    t.vector =vector^a.vector;
    return t;
}
Set <my_type> operator &=(const Set <my_type> &a)
{
    vector &=a.vector;
    return *this;
}
Set <my_type> operator &(const Set <my_type> &a)
{
    Set <my_type> t;
    t.vector =vector&a.vector;
    return t;
}
Set <my_type> operator ~()
{
    Set <my_type> t;
    t.vector=~vector;
    return t;
}
Set <my_type> operator +=(my_type a)
{
    vector.set_bit(a);
    return *this;
}
Set <my_type> operator -=(my_type a)
{
    vector.clear_bit(a);
    return *this;
}
Set <my_type> operator = (const Set <my_type> &a)
{
    vector=a.vector;
}
void print_vector()
{
    int i;
    for(i=0;i<256;i++)
    printf("%d",(int)vector[i]);
    printf("\n");
}
void print_chars()
{
    for(unsigned char a=0;a<255;a++)if(vector[a])printf("%c",a);
    printf("\n");
}
};
Set <char> letters_in_word(char *word) {
    Set<char> a;
    while(*word&&*word!=' ') {
    a+=*word;
    word++;
    }
    return a;
}
Set_char s_letters_in_word(char *word) {
    Set_char a;
    while(*word&&*word!=' ') {
    a+=*word;
    word++;
    }
    return a;
}
int main()
{
    int i;
    Boolv a(32);
    a[5]=1;
    a[1]=1;
    a[7]=0;
    a[31]=4;
    for(i=0;i<32;i++)printf("%d",(int)a[i]);
    printf("\n");
    Set <int> b;
    b+=5;
    b+=6;
    b.print_vector();
    char *s1="momma mia", *s2="my";
    //(letters_in_word("momma")^letters_in_word("mia")).print_chars();
    //(letters_in_word("momma")&letters_in_word("mia")).print_chars();
    //(letters_in_word("momma")|letters_in_word("mia")).print_chars();
    //(letters_in_word("momma")&~letters_in_word("mia")).print_chars();
    Set_char c=s_letters_in_word(s2);
    char*s=s1;
    printf("%s; %s\n",s1,s2);
    while(*s!=0)
    {
        Set_char d;
        while(((*s)!=0)&&((*s)!=' ')) {
            d+=*s++;
        }
        ((Set_char)(d&~c)).print_chars();
        //c.print_vector();
        //d.print_vector();
        if(*s)s++;
    }
    ((Set_char)(s_letters_in_word("momma")^s_letters_in_word("mia"))).print_chars();
}