1 #include<iostream>
2 #define MAXN 1005
3 using namespace std;
4
5 int a[MAXN];
6
7 int main()
8 {
9 //freopen("acm.acm","r",stdin);
10 int test;
11 int num;
12 char c;
13 int i;
14 int j;
15 int x;
16 int max;
17 int y;
18 cin>>test;
19 while(test --)
20 {
21 memset(a,0,sizeof(a));
22 cin>>num;
23 max = -1;
24 for(i = 0; i < num; ++ i)
25 {
26 cin>>c;
27 cin>>x>>y;
28 if(x > max)
29 max = x;
30 if(y > max)
31 max = y;
32 for(j = x; j < y; ++ j)
33 {
34 ++ a[j];
35 }
36 }
37 for(i = 0; i < max; ++ i)
38 {
39 if(a[i] == 0)
40 continue;
41 else
42 cout<<char(a[i]-1+65);
43 }
44 cout<<endl;
45 }
46 }
