#include<bits/stdc++.h>
#define ll long long
using namespace std;
int n,m,k,r,p,vst;
ll a[200005];
int fa[200005],hs[200005],sz[200005],top[200005],dfn[200005],rdfn[200005],dep[200005];
vector<int>G[200005];
void dfs(int u,int fat) {
	fa[u]=fat;
	sz[u]=1;
	dep[u]=dep[fat]+1;
	for(auto &v:G[u]) {
		if(v==fat)continue;
		dfs(v,u);
		sz[u]+=sz[v];
		if(sz[v]>sz[hs[u]])hs[u]=v;
	}
}
void cut(int u,int tp) {
	dfn[u]=++vst;
	rdfn[vst]=u;
	top[u]=tp;
	if(hs[u]) {
		cut(hs[u],tp);
		for(auto &v:G[u])if(v!=fa[u]&&v!=hs[u])cut(v,v);
	}
}
ll tr[800020],trr[800020];
void pup(int u) {
	tr[u]=tr[u<<1]+tr[u<<1|1];
	trr[u]=trr[u<<1]+trr[u<<1|1];
}
void build(int u,int le,int ri) {
	if(le==ri) {
		tr[u]=trr[u]=a[rdfn[le]];
		return;
	}
	int mid=(le+ri)>>1;
	build(u<<1,le,mid);
	build(u<<1|1,mid+1,ri);
	pup(u);
}
bool inr(int le,int ri,int L,int R) {
	return (L<=le)&&(ri<=R);
}
bool otr(int le,int ri,int L,int R) {
	return (le>R)||(ri<L);
}
ll query(int u,int le,int ri,int L,int R) {
	if(inr(le,ri,L,R))return tr[u];
	else if(!otr(le,ri,L,R)) {
		int mid=(le+ri)>>1;
		return (query(u<<1,le,mid,L,R)+query(u<<1|1,mid+1,ri,L,R));
	}
	return 0;
}
ll qry(int x,int y) {
	ll ans=0;
	while(top[x]!=top[y]) {
		if(dep[top[x]]<dep[top[y]])swap(x,y);
		ans+=query(1,1,n,dfn[top[x]],dfn[x]);
		x=fa[top[x]];
	}
	return (ans+query(1,1,n,min(dfn[x],dfn[y]),max(dfn[x],dfn[y])));
}
ll query2(int u,int le,int ri,int L,int R) {
	if(inr(le,ri,L,R))return tr[u];
	else if(!otr(le,ri,L,R)) {
		int mid=(le+ri)>>1;
		return max(query2(u<<1,le,mid,L,R),query2(u<<1|1,mid+1,ri,L,R));
	}
	return 0;
}
ll qry2(int x,int y) {
	ll ans=INT_MIN;
	while(top[x]!=top[y]) {
		if(dep[top[x]]<dep[top[y]])swap(x,y);
		ans+=query2(1,1,n,dfn[top[x]],dfn[x]);
		x=fa[top[x]];
	}
	return max(ans,query2(1,1,n,min(dfn[x],dfn[y]),max(dfn[x],dfn[y])));
}
void update(int u,int le,int ri,int ft,ll x) {
	int mid=(le+ri)>>1;
	if(le==ri){
		tr[u]=trr[u]=x;
		return;
	}
	if(ft<=mid)update(u<<1,le,mid,ft,x);
	else update(u<<1|1,mid+1,ri,ft,x);
	pup(u);
}
int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1; i<n; i++) {
		int u,v;
		cin>>u>>v;
		G[u].push_back(v);
		G[v].push_back(u);
	}
	for(int i=1; i<=n; i++)cin>>a[i];
	cin>>m;
	for(int i=1;i<=n;i++)sort(G[i].begin(),G[i].end(),[](int x,int y){return a[x]<a[y];});
	dfs(r,0);
	cut(r,0);
	build(1,1,n);
	while(m--) {
		string ord;
		cin>>ord;
		if(ord=="QSUM"){
			int u,v;
			cin>>u>>v;
			cout<<qry(u,v)<<'\n';
		}else if(ord=="CHANGE"){
			int u,v;
			cin>>u>>v;
			update(1,1,n,dfn[u],v);
		}else if(ord=="QMAX"){
			int u,v;
			cin>>u>>v;
			cout<<qry2(u,v)<<'\n';
		}
	}
}