Bessla Motors

Farmer John would like to promote his line of Bessla electric tractors by showcasing Bessla's network of charging stations. He has identified $N$ ($2\le N\le 5\cdot 10^4$) points of interest labeled $1\dots N$, of which the first $C$ ($1\le C < N$) are charging stations and the remainder are travel destinations. These points of interest are interconnected by $M$ ($1\le M\le 10^5$) bidirectional roads, the $i$-th of which connects distinct points $u_i$ and $v_i$ ($1\le u_i, v_i\le N$) and has length $\ell_i$ miles ($1\le\ell_i\le 10^9$).

A Bessla can travel up to $2R$ miles ($1\le R\le 10^9$) on a single charge, allowing it to reach any destination within $R$ miles of a charging station. A destination is deemed well-connected if it is reachable from at least $K$ ($1\le K\le 10$) distinct charging stations. Your task is to assist Farmer John in identifying the set of well-connected travel destinations.

The first line contains five space-separated integers $N$, $M$, $C$, $R$, and $K$. Each of the following $M$ lines contains three space-separated integers $u_i$, $v_i$, and $\ell_i$ such that $u_i\neq v_i$.

The charging stations are labeled $1, 2, \ldots, C$. The remaining points of interest are all travel destinations.

First, output the number of well-connected travel destinations on a single line. Then, list all well-connected travel destinations in ascending order, each on a separate line.