// Source: https://u...content-available-to-author-only...o.guide/general/io
 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
int cnt[1000005];
int main() {
	string s; cin>>s;
    for (int i=0;i<s.size();i++) cnt[s[i]-'a']++;
    for (int i=0;i<s.size();i++){
        if (s[i]==s[i-1]) continue;
        if (cnt[s[i]-'a']>1) {
            cout<<cnt[s[i]-'a']<<s[i];
            // cnt[s[i]]=0;
        }
 
        if (cnt[s[i]-'a']==1) cout<<s[i];
    }
}
 

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