#include<iostream>
using namespace std;

int main(){
    
    string s,ans;
    cin>>s;
    
    int i=0; 
    while(i<s.size()){
        int count=1;
        while(s[i]==s[i+1]){
            count++;
            i++;
        }
        char temp='0'+count;
        ans.push_back(temp);
        ans.push_back(s[i]);
        i++;
    }
    cout<<ans<<endl;
    return 0;
}

求助求助，第三个测试点WA