sumcifnrcif

#include <iostream>
using namespace std;

int main()
{
    unsigned long long int n;
    cin>>n;
    int s=0;
    while(n)
        s+=n%10,n/=10;
    int nc=0;
    while(s)
        ++nc,s/=10;
    cout<<nc;
    return 0;
}