#include <iostream>
using namespace std;

int main(){
    string s;
    cin >> s;

    for(int i = 0; i < s.size();) {
        int brojac = 0;
        char c = s[i];

        while(i < s.size() and s[i] == c) {
            i++;
            brojac++;
        }

        cout << brojac << c;
    }
    cout << endl;
    return 0;
}