#include <bits/stdc++.h>

using namespace std;

int main() {
    string str;
    cin >> str;
    for (int i = 0; i < str.length();) {
        //查找一样的
        char a = str[i];
        int count = 0;
        //对于一样的就只记数不输出
        while (str[i] == a && i < str.length()) {
            count++;
            i++;
        }
        cout << count << a;
    }
    return 0;
}