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#include <bits/stdc++.h>
using namespace std;

int main()
{

string s;
cin>>s;

char c=s[0];
int cnt=1;
for(int i=1;i<s.size();++i)
{
if(s[i]==c)
{
cnt++;
}
else {
cout<<c<<cnt;
cnt=1;
c=s[i];
}
}
cout<<c<<cnt<<endl;

}

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