#include <iostream>
#include <string>
using namespace std;
int main() {
string s;
cin>>s;
int n=s.length();
string encode="";
int i=0,count;
char temp;
while(i<n)
{
temp=s[i];
count=0;
while(i<n && s[i]==temp)
{
i++;
count++;
}
encode=encode+temp+to_string(count);
}
cout<<encode;
return 0;
}
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