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

int main(int argc, char *argv[])
{
    int s = 0, i, counter = 1;
    char c, *chars;

    if(strcmp(argv[1], "e") == 0)
    {
        c = getchar();

        if(c != '\n')
        {
            s++;

            chars = (char *)malloc(s * sizeof(char));
            chars[s-1] = c;
        } else
        {
            printf("\n");
            return 0;
        }

        c = getchar();

        while(c != '\n')
        {
            s++;
            chars = (char *)realloc(chars, s * sizeof(char));

            chars[s-1] = c;
            c = getchar();
        }

        chars[s] = '\0';

        for(i = 0; i < s; i++)
        {
            if(chars[i] == chars[i+1] && i < s-1)
            {
                counter++;
            } else
            {
                printf("%d%c", counter, chars[i]);
                counter = 1;
            }
        }
    } else if(strcmp(argv[1], "d") == 0)
    {

    }

    printf("\n");
    return 0;
}