#include "bits/stdc++.h"
using namespace std;
#define fi first
#define se second
#define mp make_pair
#define pii pair<int,int>
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define pb push_back
#define sz(x) (int)(x).size()
#define rsz resize
#define ass assign
#define F(i,l,r) for(int i=(l);i<(r);++i)
typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
template<typename T> using pqg = priority_queue<T, vector<T>, greater<T>>;
#define each(a,x) for(auto a:x)
#define FOR(i,a) for(int i=0;i<(a);i++)
#define ROF(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define eb emplace_back
#define ft front()
#define V vector
struct TECC{
int n,k;
V<V<int>> adj,t;
V<bool> used;
V<int> comp,order,low;
using edge=pii;
V<edge> br;
void dfs(int x,int prv,int &c){
used[x]=1;
order[x]=c++;
low[x]=n;
bool mul=0;
each(y,adj[x]){
if(used[y]){
if(y!=prv || mul)low[x]=min(low[x],order[y]);
else mul=1;
continue;
}
dfs(y,x,c);
low[x]=min(low[x],low[y]);
}
}
void dfs2(int x,int num){
comp[x]=num;
each(y,adj[x]){
if(!!~comp[y])continue;
if(order[x]<low[y]){
br.pb({x,y});
k++;
dfs2(y,k);
}else dfs2(y,num);
}
}
TECC(const V<V<int>> &adj):adj(adj),n(sz(adj)),used(n),comp(n,-1),order(n),low(n),k(0){
int c=0;
FOR(i,n){
if(used[i])continue;
dfs(i,-1,c);
dfs2(i,k);
k++;
}
}
void build_tree(){
t.rsz(k);
each(e,br){
int x=comp[e.fi],y=comp[e.se];
t[x].pb(y);
t[y].pb(x);
}
}
};
const int LOG=20;
V<V<pii>> tree;
V<V<int>> upp;
V<int> dep,diff_up,diff_down;
string res;
V<pii> edges;
V<int> comp;
void dfs_lca(int u,int p,int d){
dep[u]=d;
upp[0][u]=p;
each(e,tree[u]){
if(e.fi!=p)dfs_lca(e.fi,u,d+1);
}
}
int get_lca(int u,int v,int k){
if(dep[u]<dep[v])swap(u,v);
ROF(i,0,LOG){
if(!!~upp[i][0] && dep[upp[i][u]]>=dep[v])u=upp[i][u];
}
if(u==v)return u;
ROF(i,0,LOG){
if(upp[i][u]!=upp[i][v]){
u=upp[i][u];
v=upp[i][v];
}
}
return upp[0][u];
}
void dfs_solve(int u,int p){
each(e,tree[u]){
int v=e.fi,id=e.se;
if(v==p)continue;
dfs_solve(v,u);
if(diff_up[v]>0)res[id]=(comp[edges[id].fi]==v?'L':'R');
else if(diff_down[v]>0)res[id]=(comp[edges[id].fi]==u?'L':'R');
diff_up[u]+=diff_up[v];
diff_down[u]+=diff_down[v];
}
}
void solve(){
int n,m;
cin>>n>>m;
edges.rsz(m);
V<V<int>> adj(n);
FOR(i,m){
cin>>edges[i].fi>>edges[i].se;
--edges[i].fi;
--edges[i].se;
adj[edges[i].fi].pb(edges[i].se);
adj[edges[i].se].pb(edges[i].fi);
}
TECC tecc(adj);
comp=tecc.comp;
tree.ass(tecc.k,V<pii>());
res.ass(m,'B');
FOR(i,m){
int u=comp[edges[i].fi],v=comp[edges[i].se];
if(u!=v){
tree[u].pb({v,i});
tree[v].pb({u,i});
}
}
dep.ass(tecc.k,0);
upp.ass(LOG,V<int>(tecc.k,-1));
FOR(i,tecc.k){
if(!dep[i])dfs_lca(i,-1,1);
}
FOR(i,LOG-1){
FOR(j,tecc.k){
if(!!~upp[i][j])upp[i+1][j]=upp[i][upp[i][j]];
}
}
int q;
cin>>q;
diff_up.ass(tecc.k,0);
diff_down.ass(tecc.k,0);
while(q--){
int x,y;
cin>>x>>y;
--x;
--y;
int cx=comp[x],cy=comp[y];
if(cx==cy)continue;
int anc=get_lca(cx,cy,tecc.k);
diff_up[cx]++;
diff_up[anc]--;
diff_down[cy]++;
diff_down[anc]--;
}
FOR(i,tecc.k){
if(dep[i]==1)dfs_solve(i,-1);
}
cout<<res<<'\n';
}
signed main(){
ios_base::sync_with_stdio(0);cin.tie(nullptr);
#ifndef ONLINE_JUDGE
freopen("output.txt", "w", stdout);
freopen("input.txt", "r", stdin);
freopen("Error.txt", "w", stderr);
#endif
int tt=1;
//cin>>tt;
while(tt--)solve();
return 0;
}
