#include<bits/stdc++.h>
using namespace std;
int n[1000000],m=-1,k=0;
string s,l;
char a;
int main(){
	cin>>s;
	a=s[0];
	for(int i=0;i<=s.size();i++){
		if(s[i]==a){
			m++;
		}else{
			l+=s[i-1];
			n[k]=m+1;
			k++;
			m=0;
			a=s[i];
		}
	}
	for(int i=0;i<l.size();i++){
		if(n[i]>1){
			cout<<n[i];
		}
		cout<<l[i];
	}
}

/**************************************************************
	Problem: 1103
	User: zhengzihao
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:5984 kb
****************************************************************/