wda

#include <iostream>
#include <string>
using namespace std;
int main() {
    string s;
    cin >> s;
    int cnt=0;
    for (int i = 0; i<s.size(); i++) {
        if (s[i]=='0') {
            cnt++;
        } else {
            char s1;
            s1='a'+cnt;
            cnt=0;
            cout << s1;
        }
    }
}