B. Sum of Digits-codeforces

B. Sum of Digits-codeforces

// working.cpp by Bill Weinman <http://bw.org/>
#include <bits/stdc++.h>
using namespace std;
int main() {
	 char digits[100001];
	 cin>>digits;
	    int times=0;
	    if (digits[1] != 0)
	    {
	        int digitsum=0;
	        char* p = digits;
	        while (*p != 0)
	        {
	            digitsum += (*p - 48);
	            ++p;
	        }
	        ++times;
	        while (digitsum > 9)
	        {
	            int m=digitsum;
	            digitsum = 0;
	            while (m != 0)
	            {
	                digitsum += m % 10;
	                m /= 10;
	            }
	            ++times;
	        }
	    }
	    cout<<times<<endl;
    return 0;
}