#![allow(dead_code)]
#![allow(non_snake_case)]

macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let mut s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

struct Combination {
    MOD: u64,
    size: usize,
    fact: Vec<u64>,
    inv_fact: Vec<u64>
}

impl Combination {
    fn new(size: usize, MOD: u64) -> Self {
        let mut fact = vec![1; size + 1];
        let mut inv_fact = vec![1; size + 1];
        for i in 1..size+1 {
            fact[i] = fact[i-1] * i as u64 % MOD;
        }
        inv_fact[size] = Self::modpow(fact[size], MOD-2, MOD);
        for i in (1..size+1).rev() {
            inv_fact[i-1] = inv_fact[i] * i as u64 % MOD;
        }
        Combination {
            MOD, size,
            fact, inv_fact
        }
    }

    fn modpow(mut x:u64, mut y:u64, m:u64) -> u64 {
        let mut res: u64 = 1;
        while y > 0 {
            if y & 1 > 0 {
                res = res * x % m;
            }
            x = x * x % m;
            y >>= 1;
        }
        res
    }

    fn modinv(x: u64, m:u64) -> u64 {
        Self::modpow(x, m-2, m)
    }

    fn nPr (&self, n:usize, r:usize) -> u64 {
        if n < r { return 0 };
        self.fact[n] * self.inv_fact[n-r] % self.MOD
    }
    fn nCr (&self, n:usize, r:usize) -> u64 {
        if n < r { return 0 };
        self.fact[n] * self.inv_fact[r] % self.MOD * self.inv_fact[n-r] % self.MOD
    }
}

fn main() {
    input!{
        s:String
    }
    let l = s.len() as i32;
    println!("{}", (10 - l).abs());
}