#include<bits/stdc++.h>
using namespace std;
int main()
{
	char s[225];
	int n=0,i,j;
	gets(s);
	for(i=0;i<strlen(s);i++){
		n++;
		if(s[i]!=s[i+1]){
			if(n>1){
				cout<<n;
			}
			cout<<s[i];
			n=0;
		}
	} 
	return 0;
}

/**************************************************************
	Problem: 1103
	User: zzz
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/