AT_abc457_b [ABC457B] Arrays

You are given $ N $ sequences $ A_1, A_2, \ldots, A_N $ . The length of sequence $ A_i $ is $ L_i $ , and $ A_i = (A_{i,1}, A_{i,2}, \ldots, A_{i,L_i}) $ . After that, integers $ X $ and $ Y $ are given. Output the value of $ A_{X,Y} $ .

The input is given from Standard Input in the following format: > $ N $ $ L_1 $ $ A_{1,1} $ $ A_{1,2} $ $ \ldots $ $ A_{1,L_1} $ $ L_2 $ $ A_{2,1} $ $ A_{2,2} $ $ \ldots $ $ A_{2,L_2} $ $ \vdots $ $ L_N $ $ A_{N,1} $ $ A_{N,2} $ $ \ldots $ $ A_{N,L_N} $ $ X $ $ Y $

Output the value of $ A_{X,Y} $ .

### Sample Explanation 1 We have $ (A_1, A_2, A_3) = ((10,20,30), (7), (5,6, 7,8)) $ . Since $ A_3 = (5, 6, 7, 8) $ and $ A_{3,4} = 8 $ , output $ 8 $ . ### Sample Explanation 2 Since $ A_2 = (8, 2, 6) $ , we have $ A_{2,2} = 2 $ . ### Constraints - $ 1 \le N \le 2 \times 10^5 $ - $ 1 \le L_i $ - The sum of $ L_i $ is at most $ 2 \times 10^5 $ . - $ 1 \le A_{i,j} \le 1000 $ - $ 1 \le X \le N $ - $ 1 \le Y \le L_X $ - All input values are integers.