#include<bits/stdc++.h>
#define ll long long
#define vi vector<int>
#define pii pair<int,int>
#define all(x) x.begin(),x.end()
#define fi first
#define se second
#define pb push_back
using namespace std;
const int N = 1e6+6,inf = 1e8;
int F[N],ANS[N];
vector<pii> Q[N*4];
void qer(int v,int tl,int tr,int l,int r,int QL,int QR) {
if (l > tr || r < tl) return;
if (l <= tl && r >= tr) {
Q[v].pb({QL,QR});
return;
}
int tm = (tl + tr)/2;
qer(v*2,tl,tm,l,r,QL,QR);
qer(v*2+1,tm+1,tr,l,r,QL,QR);
}
int cans=INT_MAX;
int t[2][4*N],timer;
int *H[100000000];
int val[100000000];
void change(int&x,int c) {
++timer;
H[timer] = &x;
val[timer] = x;
x = c;
}
void rollback() {
(*H[timer]) = val[timer];
timer--;
}
bool type;
int VAL,pos,L,R;
void add(int v=1,int tl=1,int tr=1e6) {
if (tl == tr) {
if (type == 0)
change(t[0][v],min(t[0][v],VAL));
else change(t[1][v],max(t[1][v],VAL));
return;
}
int tm = (tl + tr)/2;
if (pos <= tm) {
add(v*2,tl,tm);
}
else add(v*2+1,tm+1,tr);
if (type == 0)
change(t[0][v],min(t[0][v*2],t[0][v*2+1]));
else
change(t[1][v],max(t[1][v*2],t[1][v*2+1]));
}
int get(int v=1,int tl=1,int tr=1e6) {
if (L> tr || R < tl) {
if (type == 0) return inf;
else return -inf;
}
if (L <= tl && R >= tr) return t[type][v];
int tm = (tl + tr)/2;
if (type == 0)
return min(get(v*2,tl,tm),get(v*2+1,tm+1,tr));
else return max(get(v*2,tl,tm),get(v*2+1,tm+1,tr));
}
char c;
int l,r,q,i,id,len,l1,r1;
void dfs(int v,int tl,int tr) {
int in_ans = cans;
int start_time = timer;
for (auto i1 : Q[v]) {
l = i1.fi;
r = i1.se;
type = 0;
L = r;
R = 1e6;
type = 0;
if (cans > r - l)
cans = min(cans, -l + get());
L = 1;
R = l;type = 1;
if (cans > r - l)
cans = min(cans, r - get());
pos = l;
VAL = r;
type = 0;
add(); // l-ze patara r-ebshi udidesi l, r-ze did l-ebshi umciresi r
pos = r;
VAL = l;
type = 1;
add();
}
if (tl != tr) {
int tm = (tl + tr)/2;
dfs(v*2,tl,tm);
dfs(v*2+1,tm+1,tr);
}else {
if (F[tl])
ANS[tl] = cans;
}
while(start_time != timer) {
rollback();
}
cans = in_ans;
}
pair<pii,char> query[500006];
multiset<int> AL[1000004],AR[1000004];
set<int> cnt[1000005];
main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
multiset<int> L,R;
cin >> q;
for (i = 0; i < 4*N;i ++)
t[0][i] = inf, t[1][i] = -inf;
vector<pii> t(q);
for (int i = 1; i <= q; i++) {
cin >> c >> l >> r;
query[i] = {{l,r},c};
t[i-1] = {l,r};
}
sort(all(t));
t.resize(unique(all(t)) - t.begin());
map<pii,int> ID;
for (int i = 0; i < t.size(); i++) {
ID[t[i]] = i;
}
for (i = 1; i <= q; i++) {
c= query[i].se;
l = query[i].fi.fi;
r = query[i].fi.se;
id = ID[{l,r}];
if (c == 'A') {
cnt[id].insert(i);
L.insert(l);
R.insert(r);
AR[l].insert(r);
AL[r].insert(l);
}else {
qer(1,1,q,*cnt[id].begin(),i-1,l,r);
cnt[id].erase(cnt[id].begin());
AL[r].erase(AL[r].find(l));
AR[l].erase(AR[l].find(r));
L.erase(L.find(l));
R.erase(R.find(r));
}
l = *L.rbegin();
r = *R.begin();
len = max(0,r - l);
if (len) {
l1 = l, r1 = r;
r = *AR[l1].begin();
l = *AL[r1].rbegin();
ANS[i] = r-l;
}else {
F[i] = 1;
}}
for (i= 0; i < t.size(); i++)
for (int j : cnt[i])
qer(1,1,q,j,q,t[i].fi,t[i].se);
dfs(1,1,q);
for ( i = 1; i <= q; i++)
cout << ANS[i] <<'\n';
}
