Vector

For a dynamic array A={a0,a1,...}

A={a0,a1,...} of integers, perform a sequence of the following operations: 

0 pushBack(x): add element x at the end of A randomAccess(p):

1 p print element a[p]

2 popBack(): delete the last element of A 

A is a 0-origin array and it is empty in the initial state.

The input is given in the following format.
q
q1
q2
...
qyi
Each query queryi is given by
0 x
or
1 p 
or
2
where the first digits 0, 1 and 2 represent pushBack, randomAccess and popBack operations respectively.
randomAccess and popBack operations will not be given for an empty array.

1≤q≤200,000
0≤p< the size of A
−1,000,000,000≤x≤1,000,000,000

8
0 1
0 2
0 3
2
0 4
1 0
1 1
1 2

1
2
4