#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    int d=1;
    char a=s[0];
    for(int i=0;i<s.size();i++){
        if(s[i+1]!=a){
            if(d>1){
                cout<<d;
            }   
            cout<<a;
            a=s[i+1];
            d=1;
        }else{
            d++;
        }
    }
    return 0;
}
 
/**************************************************************
	Problem: 1103
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2076 kb
****************************************************************/