#[allow(unused_imports)]
use std::char::from_digit;
#[allow(unused_imports)]
use std::cmp::{max, min};
#[allow(unused_imports)]
use std::collections::{BTreeMap, BTreeSet, BinaryHeap, HashMap, HashSet, VecDeque};
#[allow(unused_imports)]
use std::fs::File;
#[allow(unused_imports)]
use std::io::prelude::*;
#[allow(unused_imports)]
use std::io::{stdin, stdout, BufReader, BufWriter, Stdin, Stdout, Write};
#[allow(unused_imports)]
use std::mem::swap;
#[allow(unused_imports)]
use std::str::FromStr;
 
type BoxResult<T> = Result<T, Box<std::error::Error>>;
 
fn main() {
    let mut scanner = Scanner::new(stdin());
    let param = scanner.read_vector::<usize>().unwrap();
    let (n, m, l) = (param[0], param[1], param[2]);
    let mut adj = vec![vec![]; n];
    for _ in 0..m {
        let line = scanner.read_vector::<usize>().unwrap();
        let (a, b, c) = (line[0] - 1, line[1] - 1, line[2]);
        if c > l {
            continue;
        }
        adj[a].push((b, c));
        adj[b].push((a, c));
    }
    let mut costs = vec![vec![std::usize::MAX; n]; n];
    for i in 0..n {
        let arr = dijkstra(i, &adj, l);
        for j in 0..n {
            if j == i {
                continue;
            }
            costs[i][j] = arr[j];
        }
    }
    let q = scanner.read::<usize>().unwrap();
    let mut writer = BufWriter::new(stdout());
    for _ in 0..q {
        let line = scanner.read_vector::<usize>().unwrap();
        let (s, t) = (line[0] - 1, line[1] - 1);
        if costs[s][t] == std::usize::MAX {
            writeln!(&mut writer, "-1").unwrap();
        } else {
            writeln!(&mut writer, "{}", costs[s][t]).unwrap();
        }
    }
}

fn dijkstra(src: usize, adj: &[Vec<(usize, usize)>], l: usize) -> Vec<usize> {
    let mut ans = vec![std::usize::MAX; adj.len()];
    let mut costs = vec![(std::usize::MAX, 0); adj.len()];
    costs[src] = (0, l);
    let mut crt = src;
    for _ in 0..adj.len() {
        let (c, r) = costs[crt];
        if c == std::usize::MAX {
            break;
        }
        ans[crt] = c;
        for &(nxt, dist) in adj[crt].iter() {
            let new_cost = if dist > r { (c + 1, l - dist) } else { (c, r - dist) };
            if new_cost.0 < costs[nxt].0 {
                costs[nxt] = new_cost;
            } else if new_cost.0 == costs[nxt].0 && new_cost.1 > costs[nxt].1 {
                costs[nxt] = new_cost;
            }
        }
        let mut min_cost = (std::usize::MAX, std::usize::MAX);
        for i in 0..adj.len() {
            if ans[i] < std::usize::MAX {
                continue;
            }
            if costs[i].0 < min_cost.0 {
                min_cost = costs[i];
                crt = i;
            } else if costs[i].0 == min_cost.0 && costs[i].1 > min_cost.1 {
                min_cost = costs[i];
                crt = i;
            }
        }
    }
    ans
}


#[allow(dead_code)]
struct Scanner<R> {
    reader: BufReader<R>,
    buffer: String,
}
impl<R> Scanner<R>
where
    R: Read,
{
    #[allow(dead_code)]
    fn new(inner: R) -> Scanner<R> {
        let reader = BufReader::new(inner);
        let buffer = String::new();
        Scanner {
            reader: reader,
            buffer: buffer,
        }
    }
    #[allow(dead_code)]
    fn with_capacity(capacity: usize, inner: R) -> Scanner<R> {
        let reader = BufReader::with_capacity(capacity, inner);
        let buffer = String::new();
        Scanner {
            reader: reader,
            buffer: buffer,
        }
    }
 
    #[allow(dead_code)]
    fn read_line(&mut self) -> BoxResult<String> {
        self.reader.read_line(&mut self.buffer)?;
        let cloned = self.buffer.trim().to_string();
        self.buffer.clear();
        Ok(cloned)
    }
 
    #[allow(dead_code)]
    fn read<T>(&mut self) -> BoxResult<T>
    where
        T: FromStr,
        T::Err: std::fmt::Debug,
        T::Err: std::error::Error,
        T::Err: 'static,
    {
        self.reader.read_line(&mut self.buffer)?;
        let parsed = self.buffer.trim().parse()?;
        self.buffer.clear();
        Ok(parsed)
    }
    #[allow(dead_code)]
    fn read_vector<T>(&mut self) -> BoxResult<Vec<T>>
    where
        T: FromStr,
        T::Err: std::fmt::Debug,
        T::Err: std::error::Error,
        T::Err: 'static,
    {
        self.reader.read_line(&mut self.buffer)?;
        let parsed_vec = self
            .buffer
            .trim()
            .split_whitespace()
            .map(|s| s.parse())
            .collect::<Result<Vec<_>, _>>()?;
        self.buffer.clear();
        Ok(parsed_vec)
    }
    #[allow(dead_code)]
    fn read_matrix<T>(&mut self, lines: usize) -> BoxResult<Vec<Vec<T>>>
    where
        T: FromStr,
        T::Err: std::fmt::Debug,
        T::Err: std::error::Error,
        T::Err: 'static,
    {
        let mut parsed_matrix = vec![];
        for _ in 0..lines {
            self.reader.read_line(&mut self.buffer)?;
            parsed_matrix.push(
                self.buffer
                    .trim()
                    .split_whitespace()
                    .map(|s| s.parse())
                    .collect::<Result<Vec<_>, _>>()?,
            );
            self.buffer.clear();
        }
        Ok(parsed_matrix)
    }
    #[allow(dead_code)]
    fn read_chars(&mut self) -> BoxResult<Vec<char>> {
        self.reader.read_line(&mut self.buffer)?;
        let chars = self.buffer.trim().chars().collect::<Vec<_>>();
        self.buffer.clear();
        Ok(chars)
    }
}

Measured memory_bytes: 6524