use proconio::input;

fn fast_pow_mod(mut base: i64, mut exp: i64, modulo: i64) -> i64 {
    if modulo == 1 { return 0; }
    let mut result = 1;
    base %= modulo;
    while exp > 0 {
        if exp % 2 == 1 {
            result = (result * base) % modulo;
        }
        exp /= 2;
        base = (base * base) % modulo;
    }
    result
}

fn main () {
    let modulo = 998244353;
    input! {
        t: usize,
    }
    for _ in 0..t {
        input! {
            n: i64,
            m: i64,
        }
        let n = n % (2*m);

        if n <= m {
            println!("{}", (fast_pow_mod(10, n, modulo)-1).rem_euclid(modulo));
        }
        else {
            println!("{}", (fast_pow_mod(10, m, modulo)-fast_pow_mod(10, n-m, modulo)).rem_euclid(modulo));
        }

    }
}