#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>

int compare (const void * a, const void * b)
{
  return ( *(char*)a - *(char*)b );
}

int main()
{
    while(1)
    {

        if(feof(stdin))
        break;

        char string[51];


        int n = 0 ;

        while(1)
        {
            string[n] = getchar();
            if (feof(stdin)) break;
            if(string[n] == '\n')break;
            if(string[n] != ' ') n++;
        }
        if(feof(stdin))
        break;

        string[n] = '\0';
        if(n==0)
        {
            printf("\n");
            continue;
        }
        qsort(string, n, sizeof(char), compare);


        //printf("%s\n",string);

        int aux=0;
        int inicio =0;
        int i;
        for(i = 1; i < n; i++)
        {
            if(string[i] == string[i-1] +1 || string[i] == string[i-1])
            {
                aux++;
            }
            else
            {
                printf("%c:%c, ", string[inicio], string[inicio+aux]);
                aux =0;
                inicio=i;
            }

        }
        printf("%c:%c\n", string[inicio], string[inicio+aux]);


    }

    return 0;
}