#include<bits/stdc++.h>
using namespace std;
string s;
char x;
int c;
int main(){
    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: Accepted
	Time:15 ms
	Memory:2076 kb
****************************************************************/