#include<bits/stdc++.h>
using namespace std;
int main(){
string s;
char x;
int c;
cin>>s;
c=1;
x=s[0];
for(int i=1;i<=s.size()-1;i++){
	if(s[i]==x){
		c++;
	}
	else{
		if(c>1) cout<<c;
		cout<<x;
		x=s[i];
		c+1;
	}
	
} 
if(c>1) cout<<c;
cout<<x;

	return 0;
}

/**************************************************************
	Problem: 1103
	User: huxuanchen
	Language: C++
	Result: Wrong Answer
****************************************************************/