#include<bits/stdc++.h>
using namespace std;
int main()
{
    char a[255];
    int b[30]={0};
    cin>>a;
    int i=0,n=0;
    n=strlen(a);
    // for(i=0;i<n;i++){
    //     b[a[i]-'a']++;
    // }
    int cnt=1;
    for(int i=0;i<n;i++){
        if (a[i]==a[i+1]){
            cnt++;
        }
        if (a[i]!=a[i+1]){

            if(cnt!=1){
                cout<<cnt;
                cout<<a[i];
                cnt=1;
            }
        else cout<<a[i];
        }
    }

    return 0;
}
/**************************************************************
	Problem: 1103
	User: luyanchen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/