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

int main()
{
	char s[1000],t[1000];
	int i = 0,j,n,k = 0;
	gets(s);
	while(s[i] != '\0')
	{
		n = 1;
		j = i+1;
		while(s[j] != '\0' && s[i] == s[j]) n++,j++;
		if(n == 1)	//说明只有一个
			t[k++] = s[i];
		else
		{
			t[k++] = s[i];
			t[k++] = n + '0';
		}
		i = j;
	}
	t[k] = '\0';
	puts(t);
	
	return 0;
}