#include <cstdio>

int main()
{	freopen("input.txt","rt",stdin);
	freopen("output.txt","wt",stdout);


	int res=0;
	char c,t;
	int x;

	scanf("%c",&t);
	while(1)
	{	c=t;
		x=1;

		if(scanf("%c",&t)==1)
			while(t==c)
			{
				x++;
				if(scanf("%c",&t)!=1) 
				{	printf("%d%d",x,c-'0');
					return 0;
				}
			}
		else
		{	printf("%d%d",x,c-'0');
			return 0;
		}
		printf("%d%d",x,c-'0');
	}

	//printf("%d",res);
	return 0;
}