#include<bits/stdc++.h>
using namespace std;
int main()
{
	int sum=1;
	char a[256];
	cin>>a;
	for(int i=0;a[i]!='\0';i++)
	{
		if(a[i]==a[i+1]) {sum++;}
		else if(sum>1) {cout<<sum<<a[i];sum=1;}
			else {cout<<a[i];sum=1;}
		
	}
 return 0;
 }

/**************************************************************
	Problem: 1103
	User: lzc
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/