use std::fmt::format;


fn solve() -> char {
    let mut x = String::new();
    std::io::stdin().read_line(&mut x).ok();
    let x = x.trim();
    let mut y = String::new();
    std::io::stdin().read_line(&mut y).ok();
    let y = y.trim();

    if x.len() == y.len() {
        if x > y {
            return 'X';
        } else {
            return 'Y';
        }
    }
    let x = x.chars().collect::<Vec<_>>();
    let y = y.chars().collect::<Vec<_>>();
    let xlen = x.len();
    let ylen = y.len();
    if xlen > ylen {
        for i in 0..xlen*2 {
            if x[i%xlen] != y[i%ylen] {
                if x[i%xlen] > y[i%ylen] {
                    return 'X';
                } else {
                    return 'Y';
                }
            }
        }
        return 'X';
    }
    for i in 0..ylen*2 {
        if x[i%xlen] != y[i%ylen] {
            if x[i%xlen] > y[i%ylen] {
                return 'X';
            } else {
                return 'Y';
            }
        }
    }
    return 'Y';
}

fn main() {
    let mut t = String::new();
    std::io::stdin().read_line(&mut t).ok();
    let t: usize = t.trim().parse().unwrap();
    let mut result = Vec::with_capacity(t);
    for _ in 0..t {
        result.push(solve());
    }
    for &c in result.iter() {
        println!("{}", c);
    }
}