#include <cstring>
#include <iostream>
#include <algorithm>
#include <map>
#include <string>
#include <set>
#include <vector>

using namespace std;

char A[20];
int B[20];

int main()
{
	cin.sync_with_stdio(false);

	cin >> A;
	for (int i = 2; A[i] != 0; ++i)
		B[++B[0]] = A[i] - '0';
	
	int result = 10;
	for (int i = 1; i <= B[0]; ++i)
		if (B[i] != B[i - 1])
			result += 9;
		else
			result += 8;
	
	cout << result << '\n';
}