#include <iostream>
using namespace std;
int main() {
int n;
cin>>n;
int s=0,c=0;
while (n){
s+=n%10;
n/=10;
}
c=s;
if (s<=9){
cout << s;
c--;
for (int i=1; i<=c; i++) cout << '0';
}
else{
while (s>9){
cout<<'9';
s-=9;
c--;
}
cout << s;
c--;
for (int i=1; i<=c; i++) cout << '0';
}
return 0;
}
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