#include <stdio.h>

int main(void) {
	// your code goes here
	int i, count;
	char prev,text[101] = {0};
	
	scanf("%s",text);
	
	prev = text[0];
	if(prev == NULL)
	{
		printf("0\n");
	}
	else
	{
		for(i = 0;text[i] != NULL;i++)
		{
			if(text[i] < 'a' || text[i] > 'z')
				return 0;
		}
		count = 1;
	
		for(i = 1;text[i] != NULL;i++)
		{
			if(prev == text[i])
			{
				count++;
			}
			else
			{
				printf("%c", prev);
				if(count > 1)
					printf("%d",count);
				count = 1;
				prev = text[i];
			}
		}
		printf("%c", prev);
		if(count > 1)
			printf("%d",count);
		printf("\n");
	}
	return 0;
}