#include<bits/stdc++.h>
using namespace std;
int main(){
int k=0,c=0;
string s;
cin>>s;
while(s.length()>1){
k=0;
for (int i=0;i<(int)s.length();i++)k+=(s[i]-'0');
s=to_string(k);
cout<<s<<endl;
c++;
}
cout<<c;
}
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