use std::fs;

fn cmmdc(mut a: u64, mut b: u64) -> u64 {
    while b != 0 {
        let r = a % b;
        a = b;
        b = r;
    }
    a
}

fn main() {
    let input = fs::read_to_string("euclid2.in").unwrap();
    let mut iter = input.split_whitespace();

    let t: usize = iter.next().unwrap().parse().unwrap();
    let mut output = String::new();

    for _ in 0..t {
        let a: u64 = iter.next().unwrap().parse().unwrap();
        let b: u64 = iter.next().unwrap().parse().unwrap();

        output.push_str(&format!("{}\n", cmmdc(a, b)));
    }

    fs::write("euclid2.out", output).unwrap();
}