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



void run_length_encode(char *input, char *output) {
    // TODO: implement this function
    output[0] = '\0';
}


int main(void) {
    char input[1000];
    if (fgets(input, sizeof input, stdin) == NULL) { input[0] = '\0'; }
    input[strcspn(input, "\n")] = '\0';
    char output[1000];
    run_length_encode(input, output);
    printf("%s\n", output);
    return 0;
}