fn run<W: Write>(sc: &mut scanner::Scanner, out: &mut std::io::BufWriter<W>) {
    let t: u32 = sc.next();
    for _ in 0..t {
        let n: usize = sc.next();
        let m: usize = sc.next();
        let mut g = vec![vec![]; n];
        let mut neq = vec![];
        for _ in 0..m {
            let a = sc.next::<usize>() - 1;
            let b = sc.next::<usize>() - 1;
            let c = sc.next::<u32>();
            if c == 1 {
                g[a].push(b);
                g[b].push(a);
            } else {
                neq.push((a, b));
                neq.push((b, a));
            }
        }
        let inf = n as i32;
        let bfs = |s: usize| -> Vec<i32> {
            let mut dp = vec![inf; n];
            dp[s] = 0;
            let mut deq = Deque::new();
            deq.push_back(s);
            while let Some(v) = deq.pop_front() {
                let d = dp[v] + 1;
                for &u in g[v].iter() {
                    if dp[u] > d {
                        dp[u] = d;
                        deq.push_back(u);
                    }
                }
            }
            dp
        };
        let a = bfs(0);
        if a[n - 1] != inf {
            writeln!(out, "Same").ok();
            writeln!(out, "{}", a[n - 1]).ok();
            continue;
        }
        let b = bfs(n - 1);
        if let Some(v) = neq.iter().map(|p| a[p.0] + b[p.1] + 1).filter(|p| *p < inf).min() {
            writeln!(out, "Different").ok();
            writeln!(out, "{}", v).ok();
        } else {
            writeln!(out, "Unknown").ok();
        }
    }
}

// ---------- begin scannner ----------
#[allow(dead_code)]
mod scanner {
    use std::str::FromStr;
    pub struct Scanner<'a> {
        it: std::str::SplitWhitespace<'a>,
    }
    impl<'a> Scanner<'a> {
        pub fn new(s: &'a String) -> Scanner<'a> {
            Scanner {
                it: s.split_whitespace(),
            }
        }
        pub fn next<T: FromStr>(&mut self) -> T {
            self.it.next().unwrap().parse::<T>().ok().unwrap()
        }
        pub fn next_bytes(&mut self) -> Vec<u8> {
            self.it.next().unwrap().bytes().collect()
        }
        pub fn next_chars(&mut self) -> Vec<char> {
            self.it.next().unwrap().chars().collect()
        }
        pub fn next_vec<T: FromStr>(&mut self, len: usize) -> Vec<T> {
            (0..len).map(|_| self.next()).collect()
        }
    }
}
// ---------- end scannner ----------

use std::io::Write;
use std::collections::*;

type Map<K, V> = BTreeMap<K, V>;
type Set<T> = BTreeSet<T>;
type Deque<T> = VecDeque<T>;

fn main() {
    use std::io::Read;
    let mut s = String::new();
    std::io::stdin().read_to_string(&mut s).unwrap();
    let mut sc = scanner::Scanner::new(&s);
    let out = std::io::stdout();
    let mut out = std::io::BufWriter::new(out.lock());
    run(&mut sc, &mut out);
}