#include "swap.h"
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define ar array
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template <typename T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define vt vector
#define eb emplace_back
#define pb push_back
#define rsz resize
#define asn assign
#define all(c) (c).begin(), (c).end()
#define sz(x) (int)(x).size()
#define pll pair<ll, ll>
#define pii pair<int, int>
#define f first
#define s second
#define F_OR(i, a, b, s) for (int i=(a); (s)>0?i<(b):i>(b); i+=(s))
#define F_OR1(e) F_OR(i, 0, e, 1)
#define F_OR2(i, e) F_OR(i, 0, e, 1)
#define F_OR3(i, b, e) F_OR(i, b, e, 1)
#define F_OR4(i, b, e, s) F_OR(i, b, e, s)
#define GET5(a, b, c, d, e, ...) e
#define F_ORC(...) GET5(__VA_ARGS__, F_OR4, F_OR3, F_OR2, F_OR1)
#define FOR(...) F_ORC(__VA_ARGS__)(__VA_ARGS__)
#define EACH(x, a) for (auto& x: a)
template<class T> bool umin(T& a, const T& b) {
return b<a?a=b, 1:0;
}
template<class T> bool umax(T& a, const T& b) {
return a<b?a=b, 1:0;
}
ll FIRSTTRUE(function<bool(ll)> f, ll lb, ll rb) {
while(lb<rb) {
ll mb=(lb+rb)/2;
f(mb)?rb=mb:lb=mb+1;
}
return lb;
}
ll LASTTRUE(function<bool(ll)> f, ll lb, ll rb) {
while(lb<rb) {
ll mb=(lb+rb+1)/2;
f(mb)?lb=mb:rb=mb-1;
}
return lb;
}
template<class A> void read(vt<A>& v);
template<class A, size_t S> void read(ar<A, S>& a);
template<class A, class B> void read(pair<A, B>& x);
template<class T> void read(T& x) {
cin >> x;
}
void read(double& d) {
string t;
read(t);
d=stod(t);
}
void read(long double& d) {
string t;
read(t);
d=stold(t);
}
template<class H, class... T> void read(H& h, T&... t) {
read(h);
read(t...);
}
template<class A> void read(vt<A>& x) {
EACH(a, x)
read(a);
}
template<class A, size_t S> void read(array<A, S>& x) {
EACH(a, x)
read(a);
}
template<class A, class B> void read(pair<A, B>& x) {
cin >> x.first >> x.second;
}
string to_string(char c) {
return string(1, c);
}
string to_string(bool b) {
return b?"true":"false";
}
string to_string(const char* s) {
return string(s);
}
string to_string(string s) {
return s;
}
string to_string(vt<bool> v) {
string res;
FOR(sz(v))
res+=char('0'+v[i]);
return res;
}
template<size_t S> string to_string(bitset<S> b) {
string res;
FOR(S)
res+=char('0'+b[i]);
return res;
}
template<class T> string to_string(T v) {
bool f=1;
string res;
EACH(x, v) {
if(!f)
res+=' ';
f=0;
res+=to_string(x);
}
return res;
}
template<class A, class B> string to_string(pair<A, B>& x) {
return to_string(x.first) + ' ' + to_string(x.second);
}
template<class A> void write(A x) {
cout << to_string(x);
}
template<class H, class... T> void write(const H& h, const T&... t) {
write(h);
write(t...);
}
void print() {
write("\n");
}
template<class H, class... T> void print(const H& h, const T&... t) {
write(h);
if(sizeof...(t))
write(' ');
print(t...);
}
struct KRT {
int n, m, h;
vt<bool> sw;
vt<int> dsu, w, depth;
vt<vt<int>> adj, up;
void init(int a_n, int a_m) {
n=h=a_n;
m=a_m;
dsu.rsz(n+m), adj.rsz(n+m), up.asn(n+m, vt<int>(19, -1)), w.rsz(n+m), sw.asn(n+m, 0), depth.rsz(n+m);
iota(dsu.begin(), dsu.begin()+n, 0);
}
int get(int u) {
return u==dsu[u] ? u : dsu[u]=get(dsu[u]);
}
void ae(int u, int v, int i, bool deg3) {
u=get(u), v=get(v);
if (u==v) {
dsu[h]=dsu[u]=h;
adj[h].pb(u);
up[u][0]=h;
w[h]=i;
sw[h]=1;
h++;
} else {
dsu[h]=dsu[u]=dsu[v]=h;
adj[h].pb(u), adj[h].pb(v);
up[u][0]=up[v][0]=h;
w[h]=i;
sw[h]=sw[u]||sw[v]||deg3;
h++;
}
}
void dfs(int v) {
EACH(u, adj[v]) {
depth[u]=depth[v]+1;
dfs(u);
}
}
void gen() {
FOR(j, 1, 19) FOR(i, n+m) if (up[i][j-1]!=-1) up[i][j]=up[up[i][j-1]][j-1];
depth[n+m-1]=0; dfs(n+m-1);
}
int lift(int x, int k) {
FOR(19) if (k&(1<<i)) x=up[x][i];
return x;
}
int lca(int a, int b) {
a=lift(a, depth[a]-min(depth[a], depth[b]));
b=lift(b, depth[b]-min(depth[a], depth[b]));
if (a==b) return a;
FOR(i, 18, -1, -1) if (up[a][i]!=up[b][i]) a=up[a][i], b=up[b][i];
return up[a][0];
}
int trav(int u) {
if (sw[u]) return u;
FOR(i, 18, -1, -1) if (up[u][i]!=-1 && !sw[up[u][i]]) u=up[u][i];
return up[u][0];
}
int query(int a, int b) {
int c=lca(a, b);
c=trav(c);
return c!=-1 ? w[c] : -1;
}
};
struct edge {
int u, v, w;
};
KRT krt;
void init(int n, int m,
std::vector<int> U, std::vector<int> V, std::vector<int> W) {
krt.init(n, m);
vt<edge> e(m);
FOR(m) e[i]={U[i], V[i], W[i]};
sort(all(e), [](const edge& a, const edge& b) { return a.w<b.w; });
vt<int> deg(n, 0);
for (auto &[u, v, w] : e) krt.ae(u, v, w, (++deg[u]>=3 || ++deg[v]>=3));
krt.gen();
}
int getMinimumFuelCapacity(int x, int y) {
return krt.query(x, y);
}
