#include <cstdio>
#include <vector>
#include <map>
#include <algorithm>
#include <cmath>
#include <iostream>
#include <string>
#include <set>

#define rep(i,N) for(int (i)=0;(i)<(N);(i)++)
#define MOD 1000000007

using namespace std;

int powmod(int a, int b, int p) {
	if (b == 0)return 1;
	else if (b % 2 == 0)return (powmod(a*a, b / 2, p) % p);
	else return (powmod(a, b - 1, p)*a%p);
}

int factorialmod(int a, int p) {
	if (!a)return 1;
	else return a * factorialmod(a - 1, p) % p;
}

string s;

int main(){
	cin >> s;
	int len = s.length();
	cout << (abs(len-10)) << "\n";
	return 0;
}