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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long c=0,d,e,f,i,j,k,l;
- string a;
- cin>>a;
- while(a.size()>1)
- {
- c++;
- long long sum=0;
- for(i=0;i<a.size();i++)
- {
- sum+=a[i]-'0';
- }
- a=to_string(sum);
- }
- cout<<c<<endl;
- return 0;
- }
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