#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
const pair<int, int> dirs[] = {{0, 1}, {1, 1}, {1, 0}, {1, -1}, {0, -1}, {-1, -1}, {-1, 0}, {-1, 1}};
int main()
{
    auto pack = [](int64_t hi, int64_t lo) { return hi << 32 | lo; };
    unordered_map<int, unordered_map<int, bool>> m;
    unordered_set<int64_t> s;
    int x0, y0, x1, y1, n, r, a, b;
    scanf("%d%d%d%d%d", &x0, &y0, &x1, &y1, &n);
    while (n--)
    {
        scanf("%d%d%d", &r, &a, &b);
        auto &row = m[r];
        for (int i = a; i <= b; i++) row[i] = true;
    }
    queue<tuple<int, int, int>> q;
    int ans = -1;
    for (q.push({x0, y0, 0}); !q.empty() && ans == -1; q.pop())
    {
        auto [x, y, l] = q.front();
        if (x == x1 && y == y1) ans = l;
        for (auto [dx, dy] : dirs)
            if (m[x + dx][y + dy] && s.count(pack(x + dx, y + dy)) == 0)
                q.push({x + dx, y + dy, l + 1}), s.insert(pack(x + dx, y + dy));
    }
    printf("%d", ans);
    return 0;
}