#include <bits/stdc++.h>
using namespace std;
 
string collapseInput(string s) {
    // If string is empty
    if (s.empty()) {
        return "";
    }
 
    string result = "";
    int count = 1;
 
    for (int i = 1; i < s.length(); i++) {
        if (s[i] == s[i - 1]) {
            count++;
        } else {
            // Append count and character
            result += to_string(count);
            result += s[i - 1];
 
            // Reset count
            count = 1;
        }
    }
 
    // Add last group
    result += to_string(count);
    result += s[s.length() - 1];
 
    return result;
}
 
int main() {
    string s;
    cin >> s;
 
    cout << collapseInput(s);
 
    return 0;
}

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