#include <stdbool.h>
#include <stdio.h>

int group(char c)
{
    if( (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ) return 0;
    if( c >= '0' && c <= '9' ) return 1;
    return 2;
}
int i;
void print_group(char* str, int grp)
{
    while( *str ) {
        if( group(*str) == grp ) putchar(*str);
        ++str;
    }
}

int main(int argc, char* argv[])
{
    char buf[80];

printf("stroka:\n");
    while( true ) {

        fflush(stdin);
        fgets(buf, sizeof(buf), stdin);

if(((buf[i]>='a'&& buf[i]<='z')&&(buf[i]!='0'&& buf[i]!='9'))||((buf[i]>='0'&&buf[i]<='9')&&(buf[i]!='a'&&buf[i]!='z')))
{

            if (((buf[i]>='a'&&buf[i]<='z')&&(buf[i]>='0'&&buf[i]<='9')))
            {
                  if (buf[i]>='0'&&buf[i]<='9'){
              printf("cifri");
              }else printf("bykvi");
                  break;
            } else printf("RAZNIE ELEMENTS\n");


}

if( '\n' == buf[0] ){printf("VVELI 0 ELEMENTS");break;}
printf("sorting:\n");
        for( i = 0; i < 3; ++i ) print_group(buf, i);

        putchar('\n');
        break;
      }
           return 0;
}