use proconio::{input, marker::Chars};

fn main() {
    input! {
        mut t: Chars,
    }

    let n = t.len();
    for i in 0..n {
        if t[i] == '.' {
            if i >= 2 && t[i - 2] == 'S' && t[i - 1] == 'K' {
                t[i] = 'K';
            } else {
                t[i] = 'G';
            }
        }
    }

    let ans = t.windows(3).all(|w| w != &['S', 'K', 'G']);
    println!("{}", if ans { "Yes" } else { "No" });
    if ans {
        println!("{}", t.iter().collect::<String>());
    }
}