#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    int c=1;
    cin>>s;
    for(int i=0;i<s.size();i++){
        if(s[i+1]==s[i])c++;
        else{
            if(c>1){
                cout<<c;
            }
            cout<<s[i];
            c=1;
        }
    }
    return 0;   
}
/**************************************************************
	Problem: 1103
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/